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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2018	Oct. 31, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Trading Symbol	ANSS
Entity Registrant Name	ANSYS INC
Entity Central Index Key	0001013462
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		83,560,018

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 729,180	$ 881,501
Short-term investments	211	286
Accounts receivable, less allowance for doubtful accounts of $8,100 and $6,800, respectively	235,547	124,659
Other receivables and current assets	162,629	263,820
Total current assets	1,127,567	1,270,266
Property and equipment, net	57,902	57,096
Goodwill	1,575,567	1,378,553
Other intangible assets, net	219,564	157,625
Other long-term assets	53,226	35,972
Deferred income taxes	22,285	42,111
Total assets	3,056,111	2,941,623
Current liabilities:
Accounts payable	6,767	6,042
Accrued bonuses and commissions	46,720	69,925
Accrued income taxes	5,911	5,760
Other accrued expenses and liabilities	83,169	86,335
Deferred revenue - current	272,872	440,491
Total current liabilities	415,439	608,553
Long-term liabilities:
Deferred income taxes	29,955	1,461
Other long-term liabilities	62,171	85,778
Total long-term liabilities	92,126	87,239
Commitments and contingencies
Stockholders' equity:
Preferred stock, $.01 par value; 2,000,000 shares authorized; zero shares issued or outstanding	0	0
Common stock, $.01 par value; 300,000,000 shares authorized; 93,236,023 shares issued	932	932
Additional paid-in capital	850,616	873,357
Retained earnings	2,766,259	2,316,916
Treasury stock, at cost: 9,213,790 and 9,044,498 shares, respectively	(1,008,370)	(907,530)
Accumulated other comprehensive loss	(60,891)	(37,844)
Total stockholders' equity	2,548,546	2,245,831
Total liabilities and stockholders' equity	$ 3,056,111	$ 2,941,623

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Allowance for doubtful accounts	$ 8,100	$ 6,800
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	2,000,000	2,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	93,236,023	93,236,023
Treasury stock, shares	9,213,790	9,044,498

CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue:
Total revenue	$ 289,418	$ 275,585	$ 878,204	$ 792,914
Cost of sales:
Amortization	5,530	9,004	23,403	26,892
Total cost of sales	36,308	35,983	115,796	109,352
Gross profit	253,110	239,602	762,408	683,562
Operating expenses:
Selling, general and administrative	97,576	80,015	280,443	230,483
Research and development	59,019	50,144	174,906	153,524
Amortization	3,491	3,260	10,421	9,506
Total operating expenses	160,086	133,419	465,770	393,513
Operating income	93,024	106,183	296,638	290,049
Interest income	3,213	1,910	7,674	4,827
Other expense, net	(974)	(168)	(2,289)	(1,512)
Income before income tax provision	95,263	107,925	302,023	293,364
Income tax provision	5,927	34,295	35,811	86,698
Net income	$ 89,336	$ 73,630	$ 266,212	$ 206,666
Earnings per share - basic:
Earnings per share	$ 1.06	$ 0.87	$ 3.17	$ 2.43
Weighted average shares	84,158	84,774	84,065	85,132
Earnings per share - diluted:
Earnings per share	$ 1.04	$ 0.85	$ 3.09	$ 2.38
Weighted average shares	86,043	86,588	86,060	86,902
Software licenses
Revenue:
Total revenue	$ 109,103	$ 156,580	$ 350,296	$ 448,368
Cost of sales:
Total cost of sales	4,291	7,395	12,301	24,197
Maintenance and service
Revenue:
Total revenue	180,315	119,005	527,908	344,546
Cost of sales:
Total cost of sales	$ 26,487	$ 19,584	$ 80,092	$ 58,263

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net income	$ 89,336	$ 73,630	$ 266,212	$ 206,666
Other comprehensive (loss) income:
Foreign currency translation adjustments	(5,102)	4,149	(23,047)	18,225
Comprehensive income	$ 84,234	$ 77,779	$ 243,165	$ 224,891

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income	$ 266,212	$ 206,666
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	47,341	49,939
Deferred income tax benefit	(28,175)	(4,217)
Provision for bad debts	1,389	1,382
Stock-based compensation expense	58,887	39,408
Other	2,039	241
Changes in operating assets and liabilities:
Accounts receivable	32,356	17,899
Other receivables and current assets	23,207	60,754
Other long-term assets	2,458	4,495
Accounts payable, accrued expenses and current liabilities	(31,243)	(22,362)
Accrued income taxes	(2,581)	(221)
Deferred revenue	1,175	(35,502)
Other long-term liabilities	(19,562)	8,478
Net cash provided by operating activities	353,503	326,960
Cash flows from investing activities:
Acquisitions, net of cash acquired	(283,026)	(25,998)
Capital expenditures	(13,077)	(14,815)
Other investing activities	(5,510)	(20,810)
Net cash used in investing activities	(301,613)	(61,623)
Cash flows from financing activities:
Purchase of treasury stock	(192,787)	(223,291)
Restricted stock withholding taxes paid in lieu of issued shares	(26,955)	(10,075)
Proceeds from shares issued for stock-based compensation	37,398	47,992
Other financing activities	(4,939)	0
Net cash used in financing activities	(187,283)	(185,374)
Effect of exchange rate fluctuations on cash and cash equivalents	(16,928)	17,129
Net (decrease) increase in cash and cash equivalents	(152,321)	97,092
Cash and cash equivalents, beginning of period	881,501	822,479
Cash and cash equivalents, end of period	729,180	919,571
Supplemental disclosures of cash flow information:
Income taxes paid	$ 74,086	$ 84,760

Organization	9 Months Ended
Organization	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	Organization ANSYS, Inc. (hereafter the Company or ANSYS) develops and globally markets engineering simulation software and services widely used by engineers, designers, researchers and students across a broad spectrum of industries and academia, including aerospace and defense, automotive, electronics, semiconductors, energy, materials and chemical processing, turbomachinery, consumer products, healthcare, and sports. As defined by the accounting guidance for segment reporting, the Company operates as one segment. Given the integrated approach to the multi-discipline problem-solving needs of the Company's customers, a single sale of software may contain components from multiple product areas and include combined technologies. The Company also has a multi-year product and integration strategy that will result in new, combined products or changes to the historical product offerings. As a result, it is impracticable for the Company to provide accurate historical or current reporting among its various product lines.

Accounting Policies

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Accounting Policies

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared by ANSYS in accordance with accounting principles generally accepted in the United States for interim financial information for commercial and industrial companies and the instructions to the Quarterly Report on Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, the accompanying statements do not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements. The accompanying condensed consolidated financial statements should be read in conjunction with the Company's audited consolidated financial statements (and notes thereto) included in the Company's Annual Report on Form 10-K for the year ended December 31, 2017. The condensed consolidated December 31, 2017 balance sheet presented is derived from the audited December 31, 2017 balance sheet included in the most recent Annual Report on Form 10-K. In the opinion of management, all adjustments considered necessary for a fair presentation of the financial statements have been included, and all adjustments are of a normal and recurring nature. Certain items in the notes to the condensed consolidated financial statements of prior years have been reclassified to conform to the current year's presentation. These reclassifications had no effect on reported net income, comprehensive income, cash flows, total assets or total liabilities and stockholders' equity. Operating results for the three and nine months ended September 30, 2018 are not necessarily indicative of the results that may be expected for any future period.

Changes in Accounting Policies

The Company’s accounting policies are described in Note 2, “Accounting Policies,” in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017. Summarized below is the accounting guidance adopted subsequent to December 31, 2017.

Revenue from contracts with customers: In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) (ASU 2014-09). The Company adopted ASU 2014-09 and its related amendments (collectively known as ASC 606) effective January 1, 2018 using the modified retrospective approach. See Note 3 for the required disclosures related to the impact of adopting this standard and a discussion of the Company's updated policies related to revenue recognition.

Income taxes: In October 2016, the FASB issued Accounting Standards Update No. 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory (ASU 2016-16). The Company adopted ASU 2016-16 effective January 1, 2018 using the modified retrospective approach. Previous guidance required the tax effects from intra-entity asset transfers to be deferred until the asset was sold to a third party or recovered through use. ASU 2016-16 eliminated this deferral for all intra-entity asset transfers other than inventory. The adoption of the standard did not have a material effect on the Company’s condensed consolidated financial statements.

Business combinations: In January 2017, the FASB issued Accounting Standards Update No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business (ASU 2017-01). The Company prospectively adopted ASU 2017-01 effective January 1, 2018. This standard narrows the definition of a business. If substantially all the fair value of the gross assets acquired is concentrated in a single identifiable asset or group of similar identifiable assets, the acquiree is not a business. The standard also requires a business to include an input and a substantive process that significantly contributes to the ability to create outputs. This definition is expected to reduce the number of acquisitions accounted for as business combinations, which will impact the accounting treatment of certain items, including the accounting treatment of contingent consideration and transaction expenses.

Accounting Guidance Issued and Not Yet Adopted

Leases: In February 2016, the FASB issued Accounting Standards Update No. 2016-02, Leases (Topic 842) (ASU 2016-02). ASU 2016-02 requires virtually all leases, other than leases that meet the definition of a short-term lease or leases of intangible assets, to be recorded on the balance sheet with a right-of-use asset and a corresponding lease liability. Leases will be classified as either operating or finance leases based on certain criteria. This classification will determine the timing and presentation of expenses on the income statement, as well as the presentation of related cash flows. The standard is effective for annual periods beginning after December 15, 2018, including interim periods within that reporting period. A modified retrospective transition is required upon adoption. The Company plans to adopt ASU 2016-02 effective January 1, 2019 and continues to evaluate the effect that this update will have on its financial results upon adoption. The Company's preliminary assessment is that this update will materially increase the Company's assets and liabilities upon adoption. The Company has completed the inventory of its leases and policy elections, and expects that it will primarily have operating leases. The Company is currently implementing new processes and controls to meet the accounting and disclosure requirements under the new standard.

Credit losses: In June 2016, the FASB issued Accounting Standards Update No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (ASU 2016-13). The current guidance requires the allowance for doubtful accounts to be estimated based on an incurred loss model, which considers past and current conditions. ASU 2016-13 requires companies to use an expected loss model that also considers reasonable and supportable forecasts of future conditions. ASU 2016-13 is effective for annual periods beginning after December 15, 2019, including interim periods within that reporting period. Early adoption is permitted for annual periods beginning after December 15, 2018, including interim periods within that reporting period. The standard requires a cumulative-effect adjustment to the balance sheet as of the beginning of the first reporting period in which the guidance is effective. The Company is currently evaluating the effect that this update will have on its financial results upon adoption.

Implementation cost accounting for cloud computing arrangements: In August 2018, the FASB issued Accounting Standards Update No. 2018-15, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (ASU 2018-15). The standard aligns the accounting for costs incurred to implement a cloud computing arrangement (CCA) that is a service arrangement with the guidance on capitalizing costs associated with developing or obtaining internal-use software. Under ASU 2018-15, an entity would apply Subtopic 350-40 to determine which implementation costs related to a CCA that is a service contract should be capitalized. The standard does not change the accounting for the service component of a CCA. The associated cash flows will be reflected within operating activities. ASU 2018-15 is effective for annual periods beginning after December 15, 2019, including interim periods within that reporting period. Early adoption is permitted, including adoption in any interim period for which financial statements have not been issued. Entities can choose to adopt the new guidance (1) prospectively to eligible costs incurred on or after the date the guidance is first applied or (2) retrospectively. The Company is currently evaluating the effect that this update will have on its financial results upon adoption.

Cash and Cash Equivalents

Cash and cash equivalents consist primarily of highly liquid investments such as deposits held at major banks and money market funds. Cash equivalents are carried at cost, which approximates fair value. The Company’s cash and cash equivalent balances comprise the following:



	September 30, 2018			December 31, 2017
(in thousands, except percentages)	Amount		% of Total	Amount		% of Total
Cash accounts	$	332,097	45.5	$	568,587	64.5
Money market funds	397,083		54.5	312,914		35.5
Total	$	729,180		$	881,501

The Company's money market fund balances are held in various funds of a single issuer.

Revenue from Contracts with Customers

9 Months Ended

Sep. 30, 2018

Revenue from Contract with Customer [Abstract]

Revenue from Contracts with Customers

Adoption of ASC 606, Revenue from Contracts with Customers

The Company adopted ASC 606 on January 1, 2018 using the modified retrospective approach for all contracts not completed as of the date of adoption. Results for reporting periods beginning after January 1, 2018 are presented under ASC 606, while prior period amounts are not adjusted and continue to be reported in accordance with ASC 605, Revenue Recognition (ASC 605). The adoption of ASC 606 represents a change in accounting principle that will more closely align revenue recognition with the delivery of the Company’s software licenses, maintenance and services. ASC 606 requires an entity to evaluate revenue recognition by identifying a contract with a customer, identifying the performance obligations in the contract, determining the transaction price, allocating the transaction price to the performance obligations in the contract, and recognizing revenue when (or as) the entity satisfies a performance obligation.

The Company recorded an increase to retained earnings of $242.4 million, or $183.1 million net of tax, on January 1, 2018 due to the cumulative effect of the ASC 606 adoption, with the impact primarily derived from revenue related to time-based software lease licenses.

Revenue Recognition

Revenue is derived principally from the licensing of computer software products and from related maintenance contracts. The Company enters into contracts that include combinations of products, maintenance and services, which are accounted for as separate performance obligations with differing revenue recognition patterns.

Revenue from perpetual licenses is classified as software license revenue. Software license revenue is recognized up front upon delivery of the licensed product and the utility that enables the customer to access authorization keys, provided that a signed contract has been received. Typically, the Company’s perpetual licenses are sold with post-contract support (PCS), which includes unspecified technical enhancements and customer support. The Company allocates value in bundled perpetual and PCS arrangements based on the standalone selling prices of the perpetual license and PCS. Revenue from PCS is classified as maintenance revenue and is recognized ratably over the term of the contract, as the Company satisfies the PCS performance obligation over time.

In addition to perpetual licenses, the Company sells time-based lease licenses. Lease licenses are sold only as a bundled arrangement that includes the rights to a term software license and PCS. Maximizing the use of observable inputs, the Company determined that 50% of the estimated standalone selling price of the lease license is attributable to the term license and 50% is attributable to the PCS. Consistent with the perpetual sales, the license component is classified as software license revenue and recognized as revenue up front at the commencement of the lease. The PCS is classified as maintenance revenue and is recognized ratably over the term of the contract, as the Company provides the PCS benefit over time.

Revenue from training, support and other services is recognized as the services are performed. For contracts in which the service consists of a single performance obligation, such as providing a training class to a customer, the Company recognizes revenue upon completion of the performance obligation. For service contracts that are longer in duration and often include multiple performance obligations (for example, both training and consulting), the Company measures the progress toward completion of the obligations and recognizes revenue accordingly. In measuring progress towards the completion of performance obligations, the Company typically utilizes output-based estimates for services with contractual billing arrangements that are not based on time and materials, and estimates output based on the total tasks completed as compared to the total tasks required for each work contract. Input-based estimates are utilized for services that involve general consultations with contractual billing arrangements based on time and materials, utilizing direct labor as the input measure.

The Company also executes arrangements through independent channel partners in which the channel partners are authorized to market and distribute the Company's software products to end users of the Company's products and services in specified territories. In sales facilitated by channel partners, the channel partner bears the risk of collection from the end-user customer. The Company recognizes revenue from transactions with channel partners when the channel partner submits a purchase commitment, collectability from the channel partner is probable, a license agreement signed by the end-user customer is received and the performance obligation was met, at a point in time or over time as appropriate, provided that all other revenue recognition criteria are satisfied. Revenue from channel partner transactions is the amount remitted to the Company by the channel partners. This amount includes a fee for PCS that is compensation for providing technical enhancements and the second level of technical support to the end user, which is recognized over the period that PCS is to be provided. The Company does not offer right of return, product rotation or price protection to any of its channel partners.

Non-income related taxes collected from customers and remitted to governmental authorities are recorded on the condensed consolidated balance sheet as accounts receivable and accrued expenses. The collection and payment of these amounts are reported on a net basis in the condensed consolidated statements of income and do not impact reported revenues or expenses.

The Company warrants to its customers that its software will perform substantially as specified in the Company's current user manuals. The Company has not experienced significant claims related to software warranties beyond the scope of maintenance support, which the Company is already obligated to provide. The warranty is not sold, and cannot be purchased, separately. The warranty does not provide any type of additional service to the customer or performance obligation for the Company.

Significant Judgments

The Company’s contracts with customers typically include promises to transfer licenses and services to a customer. Judgment is required to determine if the promises are separate performance obligations, and if so, the allocation of the transaction price to each performance obligation. The Company uses the estimated standalone selling price method to allocate the transaction price for items that are not sold separately, particularly lease licenses sold with PCS. The estimated standalone selling price is determined using all information reasonably available to the Company, including market conditions and other observable inputs. The corresponding revenues are recognized as the related performance obligations are satisfied.

The Company applies a practical expedient to expense sales commissions as incurred when the amortization period would have been one year or less. Sales commissions associated with the initial year of multi-year contracts are expensed as incurred due to their immateriality. Sales commissions associated with multi-year contracts beyond the initial year are subject to an employee service requirement and are expensed as incurred as they are not considered incremental costs to obtain a contract.

The Company is required to adjust promised amounts of consideration for the effects of the time value of money if the timing of the payments provides the customer or the Company with a significant financing benefit. The Company considers various factors in assessing whether a financing component exists, including the duration of the contract, market interest rates and the timing of payments. The Company’s contracts do not include a significant financing component requiring adjustment to the transaction price.

Impact of ASC 606 on Condensed Consolidated Financial Statement Line Items

The following table compares the impacted assets and liabilities on the condensed consolidated balance sheet as of September 30, 2018 to the amounts had ASC 605 been in effect:



	September 30, 2018
(in thousands)	As Reported (ASC 606)		ASC 605		Change
Accounts receivable, less allowance for doubtful accounts of $8,100	$	235,547	$	102,626	$	132,921
Other receivables and current assets	162,629		255,654		(93,025		)
Other long-term assets	53,226		38,670		14,556
Deferred income tax assets	22,285		61,123		(38,838		)
Accrued income taxes	5,911		5,853		58
Other accrued expenses and liabilities	83,169		84,836		(1,667		)
Deferred revenue - current	272,872		434,129		(161,257		)
Deferred income tax liabilities	29,955		22,535		7,420
Other long-term liabilities	62,171		73,008		(10,837		)
Stockholders' equity	$	2,548,546	$	2,366,649	$	181,897

The Company recorded $244.1 million of deferred revenue to retained earnings upon the adoption of ASC 606 on January 1, 2018. The pattern of software lease license revenue recognition has changed under ASC 606. Software lease license revenue was recognized ratably over the term of the contract under the previous guidance; however, approximately 50% of the contract is recognized up front at the commencement of the lease under ASC 606. This change in the pattern of revenue recognition, coupled with the recording of deferred revenue to retained earnings at the adoption date, resulted in the changes to the condensed consolidated balance sheet line items as noted in the table above.

The following table compares the impacted amounts on the condensed consolidated statements of income for the three and nine months ended September 30, 2018 to the amounts had ASC 605 been in effect:



	Three Months Ended September 30, 2018							Nine Months Ended September 30, 2018
(in thousands, except per share data)	As Reported (ASC 606)		ASC 605		Change			As Reported (ASC 606)		ASC 605		Change
Revenue:
Software licenses	$	109,103	$	166,606	$	(57,503	)	$	350,296	$	482,656	$	(132,360	)
Maintenance and service	180,315		135,350		44,965			527,908		397,895		130,013
Cost of sales:
Software licenses	4,291		8,488		(4,197		)	12,301		25,078		(12,777		)
Maintenance and service	26,487		22,290		4,197			80,092		67,315		12,777
Income tax provision	5,927		7,685		(1,758		)	35,811		36,089		(278		)
Earnings per share:
Basic	$	1.06	$	1.19	$	(0.13	)	$	3.17	$	3.19	$	(0.02	)
Diluted	$	1.04	$	1.16	$	(0.12	)	$	3.09	$	3.12	$	(0.03	)

The impacts to reported software licenses revenue, and maintenance and service revenue, were primarily due to the PCS portion of lease license contracts now being allocated to maintenance and service revenue under ASC 606. Under the previous guidance, this revenue was reported as software licenses revenue. This decrease to software licenses revenue was partially offset by the upfront recognition of the license component of lease revenue, which would have been recognized ratably over the contract under prior guidance. Consistent with the change in revenue, there was a corresponding reclassification within cost of sales. Costs incurred related to the PCS portion of lease license contracts are reflected in cost of maintenance and service. Under the previous guidance, such costs were reflected within cost of software licenses.

The adoption of ASC 606 had no impact on the Company’s cash flows from operations. However, with the adoption of ASC 606, there will be income tax payments associated with deferred revenue and backlog credited to retained earnings and never recognized as revenue in the financial statements. The 2018 tax payments related to the adoption of ASC 606 are expected to be $12.0 million - $15.0 million.

Disaggregation of Revenue

The following tables summarize revenue:



	Three Months Ended September 30,
(in thousands)	2018 (ASC 606)		2018 (ASC 605)		2017 (ASC 605)
Revenue:
Lease licenses	$	43,202	$	106,461	$	93,956
Perpetual licenses	65,901		60,145		62,624
Software licenses	109,103		166,606		156,580
Maintenance	171,463		126,436		112,300
Service	8,852		8,914		6,705
Maintenance and service	180,315		135,350		119,005
Total revenue	$	289,418	$	301,956	$	275,585

The Company’s software licenses revenue is recognized up front, while maintenance and service revenue is generally recognized over the term of the contract. Under ASC 606, the Company derived 24.5% of its total revenue through the indirect sales channel for the three months ended September 30, 2018. Under ASC 605, the Company derived 23.5% and 24.1% of its total revenue through the indirect sales channel for the three months ended September 30, 2018 and 2017, respectively.



	Nine Months Ended September 30,
(in thousands)	2018 (ASC 606)		2018 (ASC 605)		2017 (ASC 605)
Revenue:
Lease licenses	$	148,795	$	308,699	$	279,855
Perpetual licenses	201,501		173,957		168,513
Software licenses	350,296		482,656		448,368
Maintenance	500,962		370,847		324,338
Service	26,946		27,048		20,208
Maintenance and service	527,908		397,895		344,546
Total revenue	$	878,204	$	880,551	$	792,914

Under ASC 606, the Company derived 23.9% of its total revenue through the indirect sales channel for the nine months ended September 30, 2018. Under ASC 605, the Company derived 23.5% and 24.3% of its total revenue through the indirect sales channel for the nine months ended September 30, 2018 and 2017, respectively.

Deferred Revenue

Deferred revenue consists of billings made or payments received in advance of revenue recognition from software license and maintenance agreements. The timing of revenue recognition may differ from the timing of billings to customers. Payment terms vary by the type and location of customer and the products or services offered. The time between invoicing and when payment is due is not significant. The changes in deferred revenue, inclusive of both current and long-term, are as follows:



(in thousands)	Nine Months Ended September 30, 2018
Beginning balance – January 1	$	299,730
Acquired deferred revenue	2,470
Recognition of deferred revenue	(878,204		)
Deferral of revenue	868,522
Currency translation	(6,065		)
Ending balance – September 30	$	286,453

Revenue allocated to remaining performance obligations represents contracted revenue that has not yet been recognized, which includes deferred revenue and backlog. The Company's backlog represents installment billings for periods beyond the current quarterly billing cycle and customer orders received but not processed. Revenue recognized during the nine months ended September 30, 2018 reflected above of $878.2 million included amounts in deferred revenue and backlog at the beginning of the period of $334.4 million. Total revenue allocated to remaining performance obligations was $544.7 million as of September 30, 2018 and will be recognized as revenue as follows:



(in thousands)
Next 12 months	$	412,113
Months 13-24	97,182
Months 25-36	26,976
Thereafter	8,444
Total revenue allocated to remaining performance obligations	$	544,715

Acquisition

9 Months Ended

Sep. 30, 2018

Business Combinations [Abstract]

Acquisition

On May 2, 2018, the Company completed the acquisition of 100% of the shares of OPTIS, a premier provider of software for scientific simulation of light, human vision and physics-based visualization, for a purchase price of $291.0 million, paid in cash. The acquisition will extend the Company's portfolio into the area of optical simulation to provide comprehensive sensor solutions, covering visible and infrared light, electromagnetics and acoustics for camera, radar and lidar. The acquisition met the definition of a business under ASU 2017-01.

The operating results of OPTIS have been included in the Company's condensed consolidated financial statements since May 2, 2018, the date of acquisition.

The assets and liabilities of OPTIS have been recorded based upon management's estimates of their fair market values as of the acquisition date. The following tables summarize the fair value of consideration transferred and the fair values of identified assets acquired and liabilities assumed at the acquisition date:

Fair Value of Consideration Transferred:



(in thousands)
Cash	$	290,983

Recognized Amounts of Identifiable Assets Acquired and Liabilities Assumed:



(in thousands)
Cash	$	7,957
Accounts receivable and other tangible assets	16,026
Developed software and core technologies (9 – 10 year life)	47,593
Customer lists (12 year life)	41,303
Trade names (4 – 10 year life)	10,749
Accounts payable and other liabilities	(13,396		)
Deferred revenue	(2,470		)
Net deferred tax liabilities	(21,576		)
Total identifiable net assets	$	86,186
Goodwill	$	204,797

The goodwill, which is not tax-deductible, is attributed to intangible assets that do not qualify for separate recognition, including the assembled workforce of the acquired business and the synergies expected to arise as a result of the acquisition of OPTIS.

The fair values of the assets acquired and liabilities assumed are based on preliminary calculations. The estimates and assumptions for these items are subject to change as additional information about what was known and knowable at the acquisition date is obtained during the measurement period (up to one year from the acquisition date). During the period since the OPTIS acquisition date, the Company adjusted the fair values of the assets acquired and liabilities assumed, with the offset recorded as a $2.1 million increase to goodwill. These adjustments were based on refinements to assumptions used in the preliminary valuation of accounts receivable and other tangible assets, developed software and core technologies, accounts payable and other liabilities, and information about what was known and knowable as of the acquisition date in the calculation of the net deferred tax liabilities.

In valuing deferred revenue on the OPTIS balance sheet as of the acquisition date, the Company applied the fair value provisions applicable to the accounting for business combinations. Acquired deferred revenue with a historical carrying value of $14.2 million under ASC 606, and $22.3 million under ASC 605, was ascribed a fair value of $2.5 million on the opening balance sheet. As a result, the Company's post-acquisition revenue will be less than the sum of what would have otherwise been reported by ANSYS and OPTIS absent the acquisition. Under ASC 606, the impacts on reported revenue for the three and nine months ended September 30, 2018 were $3.5 million and $6.2 million, respectively. The expected impacts on reported revenue are $2.5 million and $8.7 million for the quarter ending December 31, 2018 and for the year ending December 31, 2018, respectively. Under ASC 605, the impacts on reported revenue for the three and nine months ended September 30, 2018 were $5.9 million and $10.4 million, respectively. The expected impacts on reported revenue are $4.1 million and $14.5 million for the quarter ending December 31, 2018 and for the year ending December 31, 2018, respectively.

Full pro forma results of operations have not been presented as the effects of the OPTIS business combination were not material to the Company's consolidated results of operations. The table presented below reflects the impact of OPTIS from the date of acquisition to September 30, 2018. The operating loss is derived from the OPTIS legal structure and does not include integration costs borne directly by ANSYS, Inc. and its non-OPTIS subsidiaries as a result of the acquisition.



	Three Months Ended September 30, 2018						Nine Months Ended September 30, 2018
(in thousands)	ASC 606			ASC 605			ASC 606			ASC 605
Revenue	$	6,021		$	3,803		$	9,187		$	5,873
Operating loss	$	(2,769	)	$	(4,987	)	$	(6,081	)	$	(9,395	)

Receivables and Other Current Assets

9 Months Ended

Sep. 30, 2018

Prepaid Expense and Other Assets, Current [Abstract]

Receivables and Other Current Assets

The Company's receivables and other current assets comprise the following balances:



(in thousands)	September 30, 2018		December 31, 2017
Accounts receivable, less allowance for doubtful accounts of $8,100 and $6,800, respectively	$	235,547	$	124,659

Receivables related to unrecognized revenue	$	93,960	$	215,155
Income taxes receivable, including overpayments and refunds	32,444		21,663
Prepaid expenses and other current assets	36,225		27,002
Total other receivables and current assets	$	162,629	$	263,820

Receivables for unrecognized revenue represent the current portion of billings made for software maintenance that have not yet been recognized as revenue.

Upon the adoption of ASC 606 on January 1, 2018, the opening balances of accounts receivable and receivables related to unrecognized revenue were $278.8 million and $136.4 million, respectively.

Earnings Per Share

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Earnings Per Share

Basic earnings per share (EPS) amounts are computed by dividing earnings by the weighted average number of common shares outstanding during the period. Diluted EPS amounts assume the issuance of common stock for all potentially dilutive equivalents outstanding. To the extent stock awards are anti-dilutive, they are excluded from the calculation of diluted EPS.

The details of basic and diluted EPS are as follows:



	Three Months Ended				Nine Months Ended
(in thousands, except per share data)	September 30, 2018		September 30, 2017		September 30, 2018		September 30, 2017
Net income	$	89,336	$	73,630	$	266,212	$	206,666
Weighted average shares outstanding – basic	84,158		84,774		84,065		85,132
Dilutive effect of stock plans	1,885		1,814		1,995		1,770
Weighted average shares outstanding – diluted	86,043		86,588		86,060		86,902
Basic earnings per share	$	1.06	$	0.87	$	3.17	$	2.43
Diluted earnings per share	$	1.04	$	0.85	$	3.09	$	2.38
Anti-dilutive shares	—		27		—		112

Goodwill and Intangible Assets

9 Months Ended

Sep. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

The Company's intangible assets and estimated useful lives are classified as follows:



	September 30, 2018					December 31, 2017
(in thousands)	Gross Carrying Amount		Accumulated Amortization			Gross Carrying Amount		Accumulated Amortization
Finite-lived intangible assets:
Developed software and core technologies (3 – 11 years)	$	411,406	$	(311,938	)	$	365,317	$	(297,645	)
Customer lists and contract backlog (5 – 15 years)	209,172		(113,881		)	171,048		(104,522		)
Trade names (2 – 10 years)	137,402		(112,954		)	127,200		(104,130		)
Total	$	757,980	$	(538,773	)	$	663,565	$	(506,297	)
Indefinite-lived intangible asset:
Trade name	$	357				$	357

Amortization expense for the intangible assets reflected above was $9.0 million and $12.3 million for the three months ended September 30, 2018 and 2017, respectively. Amortization expense for the intangible assets reflected above was $33.8 million and $36.4 million for the nine months ended September 30, 2018 and 2017, respectively.

As of September 30, 2018, estimated future amortization expense for the intangible assets reflected above is as follows:



(in thousands)
Remainder of 2018	$	7,142
2019	31,618
2020	32,823
2021	30,029
2022	26,342
2023	23,429
Thereafter	67,824
Total intangible assets subject to amortization	219,207
Indefinite-lived trade name	357
Other intangible assets, net	$	219,564

The changes in goodwill during the nine months ended September 30, 2018 and 2017 were as follows:



(in thousands)	2018			2017
Beginning balance – January 1	$	1,378,553		$	1,337,215
Acquisitions and adjustments⁽¹⁾	204,271			11,719
Currency translation	(7,257		)	4,510
Ending balance – September 30	$	1,575,567		$	1,353,444

⁽¹⁾ In accordance with the accounting for business combinations, the Company recorded adjustments to goodwill for the effect of changes in the provisional fair values of the assets acquired and liabilities assumed during the measurement period (up to one year from the acquisition date) as the Company obtained new information about facts and circumstances that existed as of the acquisition date that, if known, would have affected the measurement of the amounts recognized as of that date.

During the first quarter of 2018, the Company completed the annual impairment test for goodwill and the indefinite-lived intangible asset and determined that these assets had not been impaired as of the test date, January 1, 2018. No other events or circumstances changed during the nine months ended September 30, 2018 that would indicate that the fair values of the Company's reporting unit and indefinite-lived intangible asset are below their carrying amounts.

Fair Value Measurement

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurement

The valuation hierarchy for disclosure of assets and liabilities reported at fair value prioritizes the inputs for such valuations into three broad levels:


•	Level 1: quoted prices (unadjusted) in active markets for identical assets or liabilities;


•	Level 2: quoted prices for similar assets and liabilities in active markets or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the financial instrument; or


•	Level 3: unobservable inputs based on the Company's own assumptions used to measure assets and liabilities at fair value.

A financial asset's or liability's classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement.

The following tables provide the assets carried at fair value and measured on a recurring basis:



			Fair Value Measurements at Reporting Date Using:
(in thousands)	September 30, 2018		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Cash equivalents	$	397,083	$	397,083	$	—	$	—
Short-term investments	$	211	$	—	$	211	$	—
Deferred compensation plan investments	$	1,840	$	1,840	$	—	$	—



			Fair Value Measurements at Reporting Date Using:
(in thousands)	December 31, 2017		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Cash equivalents	$	312,914	$	312,914	$	—	$	—
Short-term investments	$	286	$	—	$	286	$	—
Deferred compensation plan investments	$	3,742	$	3,742	$	—	$	—

The cash equivalents in the preceding tables represent money market funds.

The short-term investments in the preceding tables represent deposits held by certain foreign subsidiaries of the Company. The deposits have fixed interest rates with maturity dates ranging from three months to one year.

The deferred compensation plan investments in the preceding tables represent trading securities held in a rabbi trust for the benefit of the non-employee directors. These securities consist of mutual funds traded in an active market with quoted prices. As a result, the plan assets are classified as Level 1 in the fair value hierarchy. The plan assets are recorded within other long-term assets on the Company's condensed consolidated balance sheets.

The carrying values of cash, accounts receivable, accounts payable, accrued expenses, other accrued liabilities and short-term obligations approximate their fair values because of their short-term nature.

Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Tax Cuts and Jobs Act On December 22, 2017, the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (Tax Reform), making broad and complex changes to the U.S. tax code. The SEC staff issued Staff Accounting Bulletin (SAB) 118, which provides guidance on accounting for the tax effects of Tax Reform and allows for provisional adjustments recorded in the December 31, 2017 financial statements to be adjusted as calculations are completed during the measurement period. SAB 118 provides a measurement period that should not extend beyond one year from enactment for companies to complete the accounting under ASC 740, Income Taxes. As further discussed below, in accordance with SAB 118, the Company was able to complete final or provisional calculations for certain elements of Tax Reform, and the amounts and estimates are included in the financial statements and have been updated as additional information was gathered. For other elements, the Company was not yet able to make reasonable estimates, and therefore, those elements have not been recorded and are accounted for in accordance with ASC 740 on the basis of the tax laws in effect before Tax Reform. The Company’s accounting for the transition tax is incomplete. However, reasonable estimates of certain effects could be calculated, and a provisional adjustment of $16.0 million was recorded in the December 31, 2017 financial statements. To determine the amount of the transition tax, the Company must determine, in addition to other factors, the amount of post-1986 earnings and profits (E&P) of the relevant subsidiaries, as well as the amount of non-U.S. income taxes paid on such earnings. Based on revised E&P calculations updated during the measurement period, the Company recognized an additional measurement-period adjustment of $0.9 million to the transition tax obligation and a corresponding adjustment to tax expense, resulting in a total transition tax obligation of $16.9 million. The Company plans to elect to pay this liability over eight years; however, in accordance with IRS issued guidance, tax overpayments from the year ended December 31, 2017 are required to be applied to the transition tax obligation. Based on this guidance, $15.7 million of the obligation has been paid, with the remaining $1.2 million recorded in other long-term liabilities at September 30, 2018. The Company will continue to gather additional information to more precisely compute the final amount as further adjustments to E&P are determined. The Company expects to complete the accounting within the prescribed measurement period. The Company’s accounting for the indefinite reinvestment assertion is incomplete. However, a reasonable estimate of book and tax basis was calculated, and the Company made a provisional assertion. In general, it is the practice and intention of the Company to repatriate previously taxed earnings and to reinvest all other earnings of its non-U.S. subsidiaries. As part of Tax Reform, the Company incurred U.S. tax on substantially all of the earnings of its non-U.S. subsidiaries as part of the transition tax. This tax increased the Company’s previously taxed earnings and allows for the repatriation of the majority of its foreign earnings without any residual U.S. federal tax. The Company does not believe that there is an excess of the financial reporting basis over the tax basis of investments in foreign subsidiaries. Accordingly, any repatriation in excess of previously taxed earnings will be a non-taxable return of basis. This assertion is subject to change as additional information is gathered to precisely compute the book and tax bases of the Company’s non-U.S. subsidiaries. During the quarter ended June 30, 2018, the Company repatriated $144.3 million of foreign cash. The Company has not made any measurement-period adjustments related to its indefinite reinvestment assertion during the nine months ended September 30, 2018. However, the Company will continue to gather additional information and expects to complete the accounting within the measurement period. The Company’s accounting for the global intangible low-taxed income tax (GILTI) is incomplete. Due to the complexity of the new GILTI tax rules, the Company is continuing to evaluate this provision of Tax Reform and its application under ASC 740. Under U.S. GAAP, the Company is allowed to make an accounting policy choice of either (1) treating taxes due on future U.S. inclusions in taxable income related to GILTI as a current-period expense when incurred (the period cost method) or (2) factoring such amounts into the Company’s measurement of its deferred taxes (the deferred method). The Company’s selection of an accounting policy with respect to the new GILTI tax rules will depend, in part, on analyzing global income to determine whether future U.S. inclusions in taxable income related to GILTI are expected and, if so, the anticipated impact. Whether the Company expects to have future U.S. inclusions in taxable income related to GILTI depends not only on the current structure and estimated future results of global operations, but also on the Company’s intent and ability to modify the structure and/or the business. The Company has not made the accounting policy decision regarding whether to record deferred taxes on GILTI or expense taxes as incurred on GILTI. The current GILTI impact, which was immaterial for the three and nine months ended September 30, 2018, was recorded in the financial statements. The Company expects to complete the accounting for GILTI within the prescribed measurement period. Other Income Tax Matters The Company has $30.2 million of unrecognized tax benefits, including estimated interest and penalties, that have been recorded in other long-term liabilities in accordance with income tax accounting guidance and for which the Company is uncertain as to if or when such amounts may be settled.

Geographic Information

9 Months Ended

Sep. 30, 2018

Segments, Geographical Areas [Abstract]

Geographic Information

Revenue to external customers is attributed to individual countries based upon the location of the customer. Revenue by geographic area is as follows:



	Three Months Ended September 30,
(in thousands)	2018 (ASC 606)		2018 (ASC 605)		2017 (ASC 605)
United States	$	106,229	$	121,131	$	105,480
Japan	36,309		33,331		30,779
Germany	27,831		30,728		28,395
China	14,568		14,703		14,043
France	14,035		15,116		13,438
South Korea	12,943		14,068		15,292
Other Europe, Middle East and Africa (EMEA)	45,602		43,066		40,887
Other international	31,901		29,813		27,271
Total revenue	$	289,418	$	301,956	$	275,585



	Nine Months Ended September 30,
(in thousands)	2018 (ASC 606)		2018 (ASC 605)		2017 (ASC 605)
United States	$	327,784	$	345,886	$	305,661
Japan	109,050		101,789		94,612
Germany	97,262		92,262		79,160
South Korea	45,468		46,305		45,633
France	44,638		45,511		37,997
China	38,616		37,870		35,429
Other EMEA	136,719		132,482		116,844
Other international	78,667		78,446		77,578
Total revenue	$	878,204	$	880,551	$	792,914

Property and equipment by geographic area is as follows:



(in thousands)	September 30, 2018		December 31, 2017
United States	$	44,117	$	45,498
India	3,708		3,704
EMEA	6,326		5,114
Other international	3,751		2,780
Total property and equipment, net	$	57,902	$	57,096

Stock-Based Compensation

9 Months Ended

Sep. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation

Total stock-based compensation expense and its net impact on basic and diluted earnings per share are as follows:



	Three Months Ended						Nine Months Ended
(in thousands, except per share data)	September 30, 2018			September 30, 2017			September 30, 2018			September 30, 2017
Cost of sales:
Software licenses	$	—		$	140		$	—		$	711
Maintenance and service	1,438			739			3,880			1,894
Operating expenses:
Selling, general and administrative	13,484			8,782			33,288			23,310
Research and development	8,061			5,112			21,719			13,493
Stock-based compensation expense before taxes	22,983			14,773			58,887			39,408
Related income tax benefits	(8,611		)	(6,080		)	(30,311		)	(23,980		)
Stock-based compensation expense, net of taxes	$	14,372		$	8,693		$	28,576		$	15,428
Net impact on earnings per share:
Basic earnings per share	$	(0.17	)	$	(0.10	)	$	(0.34	)	$	(0.18	)
Diluted earnings per share	$	(0.17	)	$	(0.10	)	$	(0.33	)	$	(0.18	)

Stock Repurchase Program

9 Months Ended

Sep. 30, 2018

Class of Stock Disclosures [Abstract]

Stock Repurchase Program

Under the Company's stock repurchase program, the Company repurchased shares as follows:



	Nine Months Ended
(in thousands, except per share data)	September 30, 2018		September 30, 2017
Number of shares repurchased	1,174		2,000
Average price paid per share	$	164.14	$	111.65
Total cost	$	192,787	$	223,291

In February 2018, the Company's Board of Directors increased the number of shares authorized for repurchase to a total of 5.0 million shares under the stock repurchase program. As of September 30, 2018, 4.3 million shares remained available for repurchase under the program.

Restructuring

9 Months Ended

Sep. 30, 2018

Restructuring and Related Activities [Abstract]

Restructuring

During the fourth quarter of 2016, the Company initiated workforce realignment activities to reallocate resources to align with the Company's future strategic plans. The Company completed the workforce realignment activities as of September 30, 2017. The Company incurred related restructuring charges as follows:



(in thousands)	Gross		Net of Tax
Q4 2016	$	3,419	$	2,355
Q1 2017	9,273		6,176
Q2 2017	2,000		1,435
Q3 2017	466		331
Total restructuring charges	$	15,158	$	10,297

The restructuring charges are included in the presentation of cost of software licenses; cost of maintenance and service; research and development expense; and selling, general and administrative expense. The gross charges were fully paid as of March 31, 2018.

Contingencies and Commitments	9 Months Ended
Contingencies and Commitments	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Contingencies and Commitments	Contingencies and Commitments The Company is subject to various investigations, claims and legal proceedings that arise in the ordinary course of business, including commercial disputes, labor and employment matters, tax audits, alleged infringement of intellectual property rights and other matters. In the opinion of the Company, the resolution of pending matters is not expected to have a material adverse effect on the Company's consolidated results of operations, cash flows or financial position. However, each of these matters is subject to various uncertainties and it is possible that an unfavorable resolution of one or more of these proceedings could materially affect the Company's results of operations, cash flows or financial position. An Indian subsidiary of the Company has several service tax audits pending that have resulted in formal inquiries being received on transactions through mid-2012. The Company could incur tax charges and related liabilities of approximately $6.8 million. The service tax issues raised in the Company’s notices and inquiries are very similar to the case, M/s Microsoft Corporation (I) (P) Ltd. Vs. Commissioner of Service Tax, New Delhi, wherein the Delhi Customs, Excise and Service Tax Appellate Tribunal (CESTAT) passed a favorable ruling to Microsoft. The Microsoft case ruling was subsequently challenged in the Supreme Court by the Indian tax authority. The Company can provide no assurances on the impact that the present Microsoft case’s decision will have on the Company’s cases. The Company is uncertain as to when these service tax matters will be concluded. The Company sells software licenses and services to its customers under proprietary software license agreements. Each license agreement contains the relevant terms of the contractual arrangement with the customer, and generally includes certain provisions for indemnifying the customer against losses, expenses and liabilities from damages that are incurred by or awarded against the customer in the event the Company's software or services are found to infringe upon a patent, copyright or other proprietary right of a third party. To date, the Company has not had to reimburse any of its customers for any losses related to these indemnification provisions and no material claims asserted under these indemnification provisions are outstanding as of September 30, 2018. For several reasons, including the lack of prior material indemnification claims, the Company cannot determine the maximum amount of potential future payments, if any, related to such indemnification provisions.

Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Basis of Presentation

Changes in Accounting Policies

Accounting Guidance Issued and Not Yet Adopted

Cash and Cash Equivalents



	September 30, 2018			December 31, 2017
(in thousands, except percentages)	Amount		% of Total	Amount		% of Total
Cash accounts	$	332,097	45.5	$	568,587	64.5
Money market funds	397,083		54.5	312,914		35.5
Total	$	729,180		$	881,501

The Company's money market fund balances are held in various funds of a single issuer.

Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Cash and Cash Equivalents

The Company’s cash and cash equivalent balances comprise the following:



	September 30, 2018			December 31, 2017
(in thousands, except percentages)	Amount		% of Total	Amount		% of Total
Cash accounts	$	332,097	45.5	$	568,587	64.5
Money market funds	397,083		54.5	312,914		35.5
Total	$	729,180		$	881,501

Revenue from Contracts with Customers (Tables)

9 Months Ended

Sep. 30, 2018

Revenue from Contract with Customer [Abstract]

Impact of ASC 606 on Condensed Consolidated Financial Statement Line Items

The following table compares the impacted assets and liabilities on the condensed consolidated balance sheet as of September 30, 2018 to the amounts had ASC 605 been in effect:



	September 30, 2018
(in thousands)	As Reported (ASC 606)		ASC 605		Change
Accounts receivable, less allowance for doubtful accounts of $8,100	$	235,547	$	102,626	$	132,921
Other receivables and current assets	162,629		255,654		(93,025		)
Other long-term assets	53,226		38,670		14,556
Deferred income tax assets	22,285		61,123		(38,838		)
Accrued income taxes	5,911		5,853		58
Other accrued expenses and liabilities	83,169		84,836		(1,667		)
Deferred revenue - current	272,872		434,129		(161,257		)
Deferred income tax liabilities	29,955		22,535		7,420
Other long-term liabilities	62,171		73,008		(10,837		)
Stockholders' equity	$	2,548,546	$	2,366,649	$	181,897

The following table compares the impacted amounts on the condensed consolidated statements of income for the three and nine months ended September 30, 2018 to the amounts had ASC 605 been in effect:



	Three Months Ended September 30, 2018							Nine Months Ended September 30, 2018
(in thousands, except per share data)	As Reported (ASC 606)		ASC 605		Change			As Reported (ASC 606)		ASC 605		Change
Revenue:
Software licenses	$	109,103	$	166,606	$	(57,503	)	$	350,296	$	482,656	$	(132,360	)
Maintenance and service	180,315		135,350		44,965			527,908		397,895		130,013
Cost of sales:
Software licenses	4,291		8,488		(4,197		)	12,301		25,078		(12,777		)
Maintenance and service	26,487		22,290		4,197			80,092		67,315		12,777
Income tax provision	5,927		7,685		(1,758		)	35,811		36,089		(278		)
Earnings per share:
Basic	$	1.06	$	1.19	$	(0.13	)	$	3.17	$	3.19	$	(0.02	)
Diluted	$	1.04	$	1.16	$	(0.12	)	$	3.09	$	3.12	$	(0.03	)

Disaggregation of Revenue

The following tables summarize revenue:



	Three Months Ended September 30,
(in thousands)	2018 (ASC 606)		2018 (ASC 605)		2017 (ASC 605)
Revenue:
Lease licenses	$	43,202	$	106,461	$	93,956
Perpetual licenses	65,901		60,145		62,624
Software licenses	109,103		166,606		156,580
Maintenance	171,463		126,436		112,300
Service	8,852		8,914		6,705
Maintenance and service	180,315		135,350		119,005
Total revenue	$	289,418	$	301,956	$	275,585



	Nine Months Ended September 30,
(in thousands)	2018 (ASC 606)		2018 (ASC 605)		2017 (ASC 605)
Revenue:
Lease licenses	$	148,795	$	308,699	$	279,855
Perpetual licenses	201,501		173,957		168,513
Software licenses	350,296		482,656		448,368
Maintenance	500,962		370,847		324,338
Service	26,946		27,048		20,208
Maintenance and service	527,908		397,895		344,546
Total revenue	$	878,204	$	880,551	$	792,914

Changes in Deferred Revenue

The changes in deferred revenue, inclusive of both current and long-term, are as follows:



(in thousands)	Nine Months Ended September 30, 2018
Beginning balance – January 1	$	299,730
Acquired deferred revenue	2,470
Recognition of deferred revenue	(878,204		)
Deferral of revenue	868,522
Currency translation	(6,065		)
Ending balance – September 30	$	286,453

Remaining Performance Obligations, Expected Timing of Satisfaction

Total revenue allocated to remaining performance obligations was $544.7 million as of September 30, 2018 and will be recognized as revenue as follows:



(in thousands)
Next 12 months	$	412,113
Months 13-24	97,182
Months 25-36	26,976
Thereafter	8,444
Total revenue allocated to remaining performance obligations	$	544,715

Acquisition (Tables)

9 Months Ended

Sep. 30, 2018

Schedule of Consideration Transferred

Fair Value of Consideration Transferred:



(in thousands)
Cash	$	290,983

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed

Recognized Amounts of Identifiable Assets Acquired and Liabilities Assumed:



(in thousands)
Cash	$	7,957
Accounts receivable and other tangible assets	16,026
Developed software and core technologies (9 – 10 year life)	47,593
Customer lists (12 year life)	41,303
Trade names (4 – 10 year life)	10,749
Accounts payable and other liabilities	(13,396		)
Deferred revenue	(2,470		)
Net deferred tax liabilities	(21,576		)
Total identifiable net assets	$	86,186
Goodwill	$	204,797

Business Acquisition, Pro Forma Information

The table presented below reflects the impact of OPTIS from the date of acquisition to September 30, 2018. The operating loss is derived from the OPTIS legal structure and does not include integration costs borne directly by ANSYS, Inc. and its non-OPTIS subsidiaries as a result of the acquisition.



	Three Months Ended September 30, 2018						Nine Months Ended September 30, 2018
(in thousands)	ASC 606			ASC 605			ASC 606			ASC 605
Revenue	$	6,021		$	3,803		$	9,187		$	5,873
Operating loss	$	(2,769	)	$	(4,987	)	$	(6,081	)	$	(9,395	)

Receivables and Other Current Assets (Tables)

9 Months Ended

Sep. 30, 2018

Prepaid Expense and Other Assets, Current [Abstract]

Schedule of Receivables and Other Current Assets

The Company's receivables and other current assets comprise the following balances:



(in thousands)	September 30, 2018		December 31, 2017
Accounts receivable, less allowance for doubtful accounts of $8,100 and $6,800, respectively	$	235,547	$	124,659

Receivables related to unrecognized revenue	$	93,960	$	215,155
Income taxes receivable, including overpayments and refunds	32,444		21,663
Prepaid expenses and other current assets	36,225		27,002
Total other receivables and current assets	$	162,629	$	263,820

Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Details of Basic and Diluted EPS

The details of basic and diluted EPS are as follows:



	Three Months Ended				Nine Months Ended
(in thousands, except per share data)	September 30, 2018		September 30, 2017		September 30, 2018		September 30, 2017
Net income	$	89,336	$	73,630	$	266,212	$	206,666
Weighted average shares outstanding – basic	84,158		84,774		84,065		85,132
Dilutive effect of stock plans	1,885		1,814		1,995		1,770
Weighted average shares outstanding – diluted	86,043		86,588		86,060		86,902
Basic earnings per share	$	1.06	$	0.87	$	3.17	$	2.43
Diluted earnings per share	$	1.04	$	0.85	$	3.09	$	2.38
Anti-dilutive shares	—		27		—		112

Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets and Estimated Useful Lives

The Company's intangible assets and estimated useful lives are classified as follows:



	September 30, 2018					December 31, 2017
(in thousands)	Gross Carrying Amount		Accumulated Amortization			Gross Carrying Amount		Accumulated Amortization
Finite-lived intangible assets:
Developed software and core technologies (3 – 11 years)	$	411,406	$	(311,938	)	$	365,317	$	(297,645	)
Customer lists and contract backlog (5 – 15 years)	209,172		(113,881		)	171,048		(104,522		)
Trade names (2 – 10 years)	137,402		(112,954		)	127,200		(104,130		)
Total	$	757,980	$	(538,773	)	$	663,565	$	(506,297	)
Indefinite-lived intangible asset:
Trade name	$	357				$	357

Estimated Future Amortization Expense for Intangible Assets

As of September 30, 2018, estimated future amortization expense for the intangible assets reflected above is as follows:



(in thousands)
Remainder of 2018	$	7,142
2019	31,618
2020	32,823
2021	30,029
2022	26,342
2023	23,429
Thereafter	67,824
Total intangible assets subject to amortization	219,207
Indefinite-lived trade name	357
Other intangible assets, net	$	219,564

Changes in Goodwill

The changes in goodwill during the nine months ended September 30, 2018 and 2017 were as follows:



(in thousands)	2018			2017
Beginning balance – January 1	$	1,378,553		$	1,337,215
Acquisitions and adjustments⁽¹⁾	204,271			11,719
Currency translation	(7,257		)	4,510
Ending balance – September 30	$	1,575,567		$	1,353,444

Fair Value Measurement (Tables)

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value of Assets and Liabilities Measured on Recurring Basis

The following tables provide the assets carried at fair value and measured on a recurring basis:



			Fair Value Measurements at Reporting Date Using:
(in thousands)	September 30, 2018		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Cash equivalents	$	397,083	$	397,083	$	—	$	—
Short-term investments	$	211	$	—	$	211	$	—
Deferred compensation plan investments	$	1,840	$	1,840	$	—	$	—



			Fair Value Measurements at Reporting Date Using:
(in thousands)	December 31, 2017		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Cash equivalents	$	312,914	$	312,914	$	—	$	—
Short-term investments	$	286	$	—	$	286	$	—
Deferred compensation plan investments	$	3,742	$	3,742	$	—	$	—

Geographic Information (Tables)

9 Months Ended

Sep. 30, 2018

Segments, Geographical Areas [Abstract]

Revenue by Geographic Area

Revenue by geographic area is as follows:



	Three Months Ended September 30,
(in thousands)	2018 (ASC 606)		2018 (ASC 605)		2017 (ASC 605)
United States	$	106,229	$	121,131	$	105,480
Japan	36,309		33,331		30,779
Germany	27,831		30,728		28,395
China	14,568		14,703		14,043
France	14,035		15,116		13,438
South Korea	12,943		14,068		15,292
Other Europe, Middle East and Africa (EMEA)	45,602		43,066		40,887
Other international	31,901		29,813		27,271
Total revenue	$	289,418	$	301,956	$	275,585



	Nine Months Ended September 30,
(in thousands)	2018 (ASC 606)		2018 (ASC 605)		2017 (ASC 605)
United States	$	327,784	$	345,886	$	305,661
Japan	109,050		101,789		94,612
Germany	97,262		92,262		79,160
South Korea	45,468		46,305		45,633
France	44,638		45,511		37,997
China	38,616		37,870		35,429
Other EMEA	136,719		132,482		116,844
Other international	78,667		78,446		77,578
Total revenue	$	878,204	$	880,551	$	792,914

Property and Equipment by Geographic Area

Property and equipment by geographic area is as follows:



(in thousands)	September 30, 2018		December 31, 2017
United States	$	44,117	$	45,498
India	3,708		3,704
EMEA	6,326		5,114
Other international	3,751		2,780
Total property and equipment, net	$	57,902	$	57,096

Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation Expense and Its Net Impact on Basic and Diluted Earnings Per Share

Total stock-based compensation expense and its net impact on basic and diluted earnings per share are as follows:



	Three Months Ended						Nine Months Ended
(in thousands, except per share data)	September 30, 2018			September 30, 2017			September 30, 2018			September 30, 2017
Cost of sales:
Software licenses	$	—		$	140		$	—		$	711
Maintenance and service	1,438			739			3,880			1,894
Operating expenses:
Selling, general and administrative	13,484			8,782			33,288			23,310
Research and development	8,061			5,112			21,719			13,493
Stock-based compensation expense before taxes	22,983			14,773			58,887			39,408
Related income tax benefits	(8,611		)	(6,080		)	(30,311		)	(23,980		)
Stock-based compensation expense, net of taxes	$	14,372		$	8,693		$	28,576		$	15,428
Net impact on earnings per share:
Basic earnings per share	$	(0.17	)	$	(0.10	)	$	(0.34	)	$	(0.18	)
Diluted earnings per share	$	(0.17	)	$	(0.10	)	$	(0.33	)	$	(0.18	)

Stock Repurchase Program (Tables)

9 Months Ended

Sep. 30, 2018

Class of Stock Disclosures [Abstract]

Stock Repurchase Program

Under the Company's stock repurchase program, the Company repurchased shares as follows:



	Nine Months Ended
(in thousands, except per share data)	September 30, 2018		September 30, 2017
Number of shares repurchased	1,174		2,000
Average price paid per share	$	164.14	$	111.65
Total cost	$	192,787	$	223,291

Restructuring (Tables)

9 Months Ended

Sep. 30, 2018

Restructuring and Related Activities [Abstract]

Restructuring

The Company incurred related restructuring charges as follows:



(in thousands)	Gross		Net of Tax
Q4 2016	$	3,419	$	2,355
Q1 2017	9,273		6,176
Q2 2017	2,000		1,435
Q3 2017	466		331
Total restructuring charges	$	15,158	$	10,297

Organization - Additional Information (Detail)	9 Months Ended
Organization - Additional Information (Detail)	Sep. 30, 2018 Segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of operating segments	1

Cash and Cash Equivalents (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Cash accounts, Amount	$ 332,097	$ 568,587
Money market funds, Amount	397,083	312,914
Total	$ 729,180	$ 881,501	$ 919,571	$ 822,479
Cash accounts, % of Total	45.54%	64.50%
Money market funds, % of Total	54.46%	35.50%

Accounting Policies - Additional Information (Detail)	Sep. 30, 2018	Dec. 31, 2017
Money Market Funds [Member]
Cash and Cash Equivalents [Line Items]
Concentration Risk, Percentage	100.00%	100.00%

Revenue from Contracts with Customers - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2018	Jan. 01, 2018
Total revenue	$ 289,418	$ 275,585	$ 878,204	$ 792,914
Cumulative Effect of New Accounting Principle in Period of Adoption						$ 183,100
Lease License to License Revenue			50.00%
Lease License to Maintenance Revenue			50.00%
Amount of Revenue Recognized From Beginning Deferred Revenue and Backlog			$ 334,400
Revenue, Remaining Performance Obligation, Amount	544,715		544,715
Minimum \| Scenario, Forecast
2018 Tax Payments Related to the Adoption of ASC 606					$ 12,000
Maximum \| Scenario, Forecast
2018 Tax Payments Related to the Adoption of ASC 606					$ 15,000
Gross impact
Cumulative Effect of New Accounting Principle in Period of Adoption						242,400
Deferred Revenue
Cumulative Effect of New Accounting Principle in Period of Adoption						$ 244,100
Calculated under Revenue Guidance in Effect before Topic 606
Total revenue	$ 301,956		$ 880,551

Impact of ASC 606 on Condensed Consolidated Financial Statement Line Items (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Accounts receivable, less allowance for doubtful accounts of $8,100	$ 235,547		$ 235,547		$ 124,659
Other receivables and current assets	162,629		162,629		263,820
Other long-term assets	53,226		53,226		35,972
Deferred income tax assets	22,285		22,285		42,111
Accrued income taxes	5,911		5,911		5,760
Other accrued expenses and liabilities	83,169		83,169		86,335
Deferred revenue - current	272,872		272,872		440,491
Deferred income tax liabilities	29,955		29,955		1,461
Other long-term liabilities	62,171		62,171		85,778
Stockholders' equity	2,548,546		2,548,546		$ 2,245,831
Total revenue	289,418	$ 275,585	878,204	$ 792,914
Total cost of sales	36,308	35,983	115,796	109,352
Income tax provision	$ 5,927	$ 34,295	$ 35,811	$ 86,698
Basic earnings per share	$ 1.06	$ 0.87	$ 3.17	$ 2.43
Diluted earnings per share	$ 1.04	$ 0.85	$ 3.09	$ 2.38
Accounting Standards Update 2014-09
Accounts receivable, less allowance for doubtful accounts of $8,100	$ 132,921		$ 132,921
Other receivables and current assets	(93,025)		(93,025)
Other long-term assets	14,556		14,556
Deferred income tax assets	(38,838)		(38,838)
Accrued income taxes	58		58
Other accrued expenses and liabilities	(1,667)		(1,667)
Deferred revenue - current	(161,257)		(161,257)
Deferred income tax liabilities	7,420		7,420
Other long-term liabilities	(10,837)		(10,837)
Stockholders' equity	181,897		181,897
Income tax provision	$ (1,758)		$ (278)
Basic earnings per share	$ (0.13)		$ (0.02)
Diluted earnings per share	$ (0.12)		$ (0.03)
Software licenses
Total revenue	$ 109,103	$ 156,580	$ 350,296	$ 448,368
Total cost of sales	4,291	7,395	12,301	24,197
Software licenses \| Accounting Standards Update 2014-09
Total revenue	(57,503)		(132,360)
Total cost of sales	(4,197)		(12,777)
Maintenance and service
Total revenue	180,315	119,005	527,908	344,546
Total cost of sales	26,487	$ 19,584	80,092	$ 58,263
Maintenance and service \| Accounting Standards Update 2014-09
Total revenue	44,965		130,013
Total cost of sales	4,197		12,777
Calculated under Revenue Guidance in Effect before Topic 606
Accounts receivable, less allowance for doubtful accounts of $8,100	102,626		102,626
Other receivables and current assets	255,654		255,654
Other long-term assets	38,670		38,670
Deferred income tax assets	61,123		61,123
Accrued income taxes	5,853		5,853
Other accrued expenses and liabilities	84,836		84,836
Deferred revenue - current	434,129		434,129
Deferred income tax liabilities	22,535		22,535
Other long-term liabilities	73,008		73,008
Stockholders' equity	2,366,649		2,366,649
Total revenue	301,956		880,551
Income tax provision	$ 7,685		$ 36,089
Basic earnings per share	$ 1.19		$ 3.19
Diluted earnings per share	$ 1.16		$ 3.12
Calculated under Revenue Guidance in Effect before Topic 606 \| Software licenses
Total revenue	$ 166,606		$ 482,656
Total cost of sales	8,488		25,078
Calculated under Revenue Guidance in Effect before Topic 606 \| Maintenance and service
Total revenue	135,350		397,895
Total cost of sales	$ 22,290		$ 67,315

Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Indirect sales channel revenue	24.46%	24.10%	23.86%	24.30%
Total revenue	$ 289,418	$ 275,585	$ 878,204	$ 792,914
Lease license
Total revenue	43,202	93,956	148,795	279,855
Perpetual license
Total revenue	65,901	62,624	201,501	168,513
Software licenses
Total revenue	109,103	156,580	350,296	448,368
Maintenance
Total revenue	171,463	112,300	500,962	324,338
Service
Total revenue	8,852	6,705	26,946	20,208
Maintenance and service
Total revenue	$ 180,315	$ 119,005	$ 527,908	$ 344,546
Calculated under Revenue Guidance in Effect before Topic 606
Indirect sales channel revenue	23.51%		23.46%
Total revenue	$ 301,956		$ 880,551
Calculated under Revenue Guidance in Effect before Topic 606 \| Lease license
Total revenue	106,461		308,699
Calculated under Revenue Guidance in Effect before Topic 606 \| Perpetual license
Total revenue	60,145		173,957
Calculated under Revenue Guidance in Effect before Topic 606 \| Software licenses
Total revenue	166,606		482,656
Calculated under Revenue Guidance in Effect before Topic 606 \| Maintenance
Total revenue	126,436		370,847
Calculated under Revenue Guidance in Effect before Topic 606 \| Service
Total revenue	8,914		27,048
Calculated under Revenue Guidance in Effect before Topic 606 \| Maintenance and service
Total revenue	$ 135,350		$ 397,895

Changes in Deferred Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	May 02, 2018
Movement in Deferred Revenue [Roll Forward]
Acquired deferred revenue					$ 2,470
Recognition of deferred revenue	$ (289,418)	$ (275,585)	$ (878,204)	$ (792,914)
Deferral of revenue			868,522
Currency translation			(6,065)
Ending balance	$ 286,453		286,453
Balance at January 1st after ASC 606 Adoption
Movement in Deferred Revenue [Roll Forward]
Beginning balance			$ 299,730

Remaining Performance Obligations, Expected Timing of Satisfaction (Details) $ in Thousands	Sep. 30, 2018 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 544,715
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 412,113
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 97,182
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 26,976
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 8,444
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

Acquisition - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
	May 02, 2018	Sep. 30, 2018	Sep. 30, 2018
Percentage of shares acquired	100.00%
Business combination, consideration transferred	$ 290,983
Business combination, historical carrying value of acquired deferred revenue	14,200
Deferred revenue	2,470
Contract with customer, liability, increase (decrease) for contract acquired in business combination		$ 3,500	$ 6,200
Business acquisition write down of deferred revenue expected impact on revenue next quarter		2,500	2,500
Business acquisition write down of deferred revenue expected impact on revenue for fiscal year		8,700	8,700
Previous Accounting Guidance
Business combination, historical carrying value of acquired deferred revenue	$ 22,300
Contract with customer, liability, increase (decrease) for contract acquired in business combination		5,900	10,400
Business acquisition write down of deferred revenue expected impact on revenue next quarter		4,100	4,100
Business acquisition write down of deferred revenue expected impact on revenue for fiscal year		$ 14,500	14,500
OPTIS
Goodwill, period increase (decrease)			$ 2,100

Consideration Transferred (Details) $ in Thousands	May 02, 2018 USD ($)
Cash	$ 290,983

Recognized Amounts of Identifiable Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Sep. 30, 2018	May 02, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Business Combination, Separately Recognized Transactions [Line Items]
Cash		$ 7,957
Accounts receivable and other tangible assets		16,026
Accounts payable and other liabilities		(13,396)
Deferred revenue		(2,470)
Net deferred tax liabilities		(21,576)
Total identifiable net assets		86,186
Goodwill	$ 1,575,567		$ 1,378,553	$ 1,353,444	$ 1,337,215
Developed Software and Core Technologies
Business Combination, Separately Recognized Transactions [Line Items]
Finite-lived intangible assets		47,593
Customer Lists and Contract Backlog
Business Combination, Separately Recognized Transactions [Line Items]
Finite-lived intangible assets		41,303
Trade Names
Business Combination, Separately Recognized Transactions [Line Items]
Finite-lived intangible assets		10,749
OPTIS
Business Combination, Separately Recognized Transactions [Line Items]
Goodwill		$ 204,797

Estimated Useful Lives (Details)		9 Months Ended
Estimated Useful Lives (Details)	May 02, 2018	Sep. 30, 2018
Customer Lists and Contract Backlog
Finite-lived intangible asset, useful life	12 years
Minimum \| Developed Software and Core Technologies
Finite-lived intangible asset, useful life	9 years	3 years
Minimum \| Customer Lists and Contract Backlog
Finite-lived intangible asset, useful life		5 years
Minimum \| Trade Names
Finite-lived intangible asset, useful life	4 years	2 years
Maximum \| Developed Software and Core Technologies
Finite-lived intangible asset, useful life	10 years	11 years
Maximum \| Customer Lists and Contract Backlog
Finite-lived intangible asset, useful life		15 years
Maximum \| Trade Names
Finite-lived intangible asset, useful life	10 years	10 years

Pro Forma Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Pro Forma Information (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue	$ 289,418	$ 275,585	$ 878,204	$ 792,914
Operating income (loss)	93,024	$ 106,183	296,638	$ 290,049
OPTIS
Revenue	6,021		9,187
Operating income (loss)	(2,769)		(6,081)
Previous Accounting Guidance \| OPTIS
Revenue	3,803		5,873
Operating income (loss)	$ (4,987)		$ (9,395)

Schedule of Receivables and Other Current Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Accounts receivable, less allowance for doubtful accounts of $8,100 and $6,800, respectively	$ 235,547	$ 124,659
Other receivables and current assets	162,629	263,820
Deferred Accounts Receivable Current Portion Of Lease Licenses And Software Maintenance [Member]
Other receivables and current assets	93,960	215,155
Taxes Receivable Related To Overpayments And Refunds [Member]
Other receivables and current assets	32,444	21,663
Prepaid Expenses and Other Current Assets [Member]
Other receivables and current assets	$ 36,225	$ 27,002

Receivables and Other Current Assets - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, less allowance for doubtful accounts of $8,100 and $6,800, respectively	$ 235,547		$ 124,659
Other receivables and current assets	162,629		263,820
Balance at January 1st after ASC 606 Adoption
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, less allowance for doubtful accounts of $8,100 and $6,800, respectively		$ 278,800
Deferred Accounts Receivable Current Portion Of Lease Licenses And Software Maintenance [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other receivables and current assets	$ 93,960		$ 215,155
Deferred Accounts Receivable Current Portion Of Lease Licenses And Software Maintenance [Member] \| Balance at January 1st after ASC 606 Adoption
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other receivables and current assets		$ 136,400

Details of Basic and Diluted EPS (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income	$ 89,336	$ 73,630	$ 266,212	$ 206,666
Weighted average shares outstanding - basic	84,158	84,774	84,065	85,132
Dilutive effect of stock plans	1,885	1,814	1,995	1,770
Weighted average shares outstanding - diluted	86,043	86,588	86,060	86,902
Basic earnings per share	$ 1.06	$ 0.87	$ 3.17	$ 2.43
Diluted earnings per share	$ 1.04	$ 0.85	$ 3.09	$ 2.38
Anti-dilutive shares	0	27	0	112

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(19))
-URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1337-109256

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 55
-Paragraph 52
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+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References

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+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Intangible Assets [Line Items]
Amortized intangible assets, gross carrying amount	$ 757,980	$ 663,565
Amortized intangible assets, accumulated amortization	(538,773)	(506,297)
Indefinite-lived intangible assets (excluding goodwill)	357
Trade Names
Intangible Assets [Line Items]
Indefinite-lived intangible assets (excluding goodwill)	357	357
Developed Software and Core Technologies
Intangible Assets [Line Items]
Amortized intangible assets, gross carrying amount	411,406	365,317
Amortized intangible assets, accumulated amortization	(311,938)	(297,645)
Customer Lists and Contract Backlog
Intangible Assets [Line Items]
Amortized intangible assets, gross carrying amount	209,172	171,048
Amortized intangible assets, accumulated amortization	(113,881)	(104,522)
Trade Names
Intangible Assets [Line Items]
Amortized intangible assets, gross carrying amount	137,402	127,200
Amortized intangible assets, accumulated amortization	$ (112,954)	$ (104,130)

Estimated Useful Lives (Detail)		9 Months Ended
Estimated Useful Lives (Detail)	May 02, 2018	Sep. 30, 2018
Customer Lists and Contract Backlog
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	12 years
Minimum \| Developed Software and Core Technologies
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	9 years	3 years
Minimum \| Customer Lists and Contract Backlog
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life		5 years
Minimum \| Trade names
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	4 years	2 years
Maximum \| Developed Software and Core Technologies
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	10 years	11 years
Maximum \| Customer Lists and Contract Backlog
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life		15 years
Maximum \| Trade names
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	10 years	10 years

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization	$ 9,021	$ 12,264	$ 33,824	$ 36,398

Estimated Future Amortization Expense for Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2018	$ 7,142
2019	31,618
2020	32,823
2021	30,029
2022	26,342
2023	23,429
Thereafter	67,824
Total intangible assets subject to amortization	219,207
Indefinite-lived intangible assets (excluding goodwill)	357
Other intangible assets, net	$ 219,564	$ 157,625

Changes in Goodwill (Detail) - USD ($) $ in Thousands	9 Months Ended
Changes in Goodwill (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Goodwill [Roll Forward]
Beginning balance	$ 1,378,553	$ 1,337,215
Acquisitions and adjustments	204,271	11,719
Currency translation	(7,257)	4,510
Ending balance	$ 1,575,567	$ 1,353,444

Fair Value of Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 397,083	$ 312,914
Short-term investments	211	286
Deferred compensation plan investments	1,840	3,742
Quoted Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	397,083	312,914
Short-term investments	0	0
Deferred compensation plan investments	1,840	3,742
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Short-term investments	211	286
Deferred compensation plan investments	0	0
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Short-term investments	0	0
Deferred compensation plan investments	$ 0	$ 0

Fair Value Measurement - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2018
Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments maturity	3 months
Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments maturity	1 year

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2018	Sep. 30, 2018	Sep. 30, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Transition Tax, Amount		$ 900	$ 16,900	$ 16,000
Transition Tax Payment		15,700
Accrued Income Taxes, Noncurrent		1,200	1,200
Foreign Earnings Repatriated	$ 144,300
Unrecognized Tax Benefits		$ 30,200	$ 30,200

Revenue by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 289,418	$ 275,585	$ 878,204	$ 792,914
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	106,229	105,480	327,784	305,661
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	36,309	30,779	109,050	94,612
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	27,831	28,395	97,262	79,160
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	14,568	14,043	38,616	35,429
France
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	14,035	13,438	44,638	37,997
South Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	12,943	15,292	45,468	45,633
Other EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	45,602	40,887	136,719	116,844
Other international
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	31,901	$ 27,271	78,667	$ 77,578
Calculated under Revenue Guidance in Effect before Topic 606
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	301,956		880,551
Calculated under Revenue Guidance in Effect before Topic 606 \| United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	121,131		345,886
Calculated under Revenue Guidance in Effect before Topic 606 \| Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	33,331		101,789
Calculated under Revenue Guidance in Effect before Topic 606 \| Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	30,728		92,262
Calculated under Revenue Guidance in Effect before Topic 606 \| China
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	14,703		37,870
Calculated under Revenue Guidance in Effect before Topic 606 \| France
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	15,116		45,511
Calculated under Revenue Guidance in Effect before Topic 606 \| South Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	14,068		46,305
Calculated under Revenue Guidance in Effect before Topic 606 \| Other EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	43,066		132,482
Calculated under Revenue Guidance in Effect before Topic 606 \| Other international
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 29,813		$ 78,446

Property and Equipment by Geographic Area (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	$ 57,902	$ 57,096
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	44,117	45,498
India
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	3,708	3,704
EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	6,326	5,114
Other international
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	$ 3,751	$ 2,780

Stock-Based Compensation Expense and Its Net Impact on Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Employee Service Share-Based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	$ 22,983	$ 14,773	$ 58,887	$ 39,408
Related income tax benefits	(8,611)	(6,080)	(30,311)	(23,980)
Stock-based compensation expense, net of taxes	$ 14,372	$ 8,693	$ 28,576	$ 15,428
Basic earnings per share	$ (0.17)	$ (0.10)	$ (0.34)	$ (0.18)
Diluted earnings per share	$ (0.17)	$ (0.10)	$ (0.33)	$ (0.18)
Software Licenses
Employee Service Share-Based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	$ 0	$ 140	$ 0	$ 711
Maintenance and Service
Employee Service Share-Based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	1,438	739	3,880	1,894
Selling, General and Administrative
Employee Service Share-Based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	13,484	8,782	33,288	23,310
Research and Development
Employee Service Share-Based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	$ 8,061	$ 5,112	$ 21,719	$ 13,493

Stock Repurchase Program (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Class of Stock Disclosures [Abstract]
Number of shares repurchased	1,174	2,000
Average price paid per share	$ 164.14	$ 111.65
Total cost	$ 192,787	$ 223,291

Stock Repurchase Program - Additional Information (Detail) shares in Millions	Sep. 30, 2018 shares
Class of Stock Disclosures [Abstract]
Stock repurchase program, repurchase authorization	5.0
Stock repurchase program, remaining number of shares authorized to be repurchased	4.3

Restructuring (Detail) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
Restructuring (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 331	$ 1,435	$ 6,176	$ 2,355	$ 10,297
Operating Income (Loss) [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 466	$ 2,000	$ 9,273	$ 3,419	$ 15,158

Contingencies and Commitments - Additional Information (Detail) $ in Millions	Sep. 30, 2018 USD ($)
India Service Tax Audit [Member]
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss	$ 6.8