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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2018	Apr. 30, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
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 Common Stock, Shares Outstanding		84,016,872

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 885,493	$ 881,501
Short-term investments	4,275	286
Accounts receivable, less allowance for doubtful accounts of $6,800	256,560	124,659
Other receivables and current assets	181,001	263,820
Total current assets	1,327,329	1,270,266
Property and equipment, net	55,806	57,096
Goodwill	1,379,458	1,378,553
Other intangible assets, net	146,396	157,625
Other long-term assets	34,731	35,972
Deferred income taxes	15,446	42,111
Total assets	2,959,166	2,941,623
Current liabilities:
Accounts payable	7,259	6,042
Accrued bonuses and commissions	23,192	69,925
Accrued income taxes	4,870	5,760
Other accrued expenses and liabilities	95,053	86,335
Deferred revenue	311,718	440,491
Total current liabilities	442,092	608,553
Long-term liabilities:
Deferred income taxes	28,849	1,461
Other long-term liabilities	80,865	85,778
Total long-term liabilities	109,714	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	833,414	873,357
Retained earnings	2,584,328	2,316,916
Treasury stock, at cost: 9,301,725 and 9,044,498 shares, respectively	(981,713)	(907,530)
Accumulated other comprehensive loss	(29,601)	(37,844)
Total stockholders' equity	2,407,360	2,245,831
Total liabilities and stockholders' equity	$ 2,959,166	$ 2,941,623

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Allowance for doubtful accounts	$ 6,800	$ 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	9,301,725	9,044,498

CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue:
Software licenses	$ 110,046	$ 141,908
Maintenance and service	172,827	111,497
Total revenue	282,873	253,405
Cost of sales:
Software licenses	3,911	9,277
Amortization	8,786	8,936
Maintenance and service	26,341	18,818
Total cost of sales	39,038	37,031
Gross profit	243,835	216,374
Operating expenses:
Selling, general and administrative	87,809	73,417
Research and development	57,530	54,378
Amortization	3,435	3,107
Total operating expenses	148,774	130,902
Operating income	95,061	85,472
Interest income	2,285	1,249
Other expense, net	(308)	(1,154)
Income before income tax provision	97,038	85,567
Income tax provision	12,758	22,261
Net income	$ 84,280	$ 63,306
Earnings per share - basic:
Earnings per share	$ 1.00	$ 0.74
Weighted average shares	83,931	85,456
Earnings per share - diluted:
Earnings per share	$ 0.98	$ 0.73
Weighted average shares	86,152	87,224

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net income	$ 84,280	$ 63,306
Other comprehensive income:
Foreign currency translation adjustments	8,243	7,569
Comprehensive income	$ 92,523	$ 70,875

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income	$ 84,280	$ 63,306
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	16,613	16,591
Deferred income tax (benefit) expense	(3,245)	9,291
Provision for bad debts	64	1,040
Stock-based compensation expense	15,269	10,513
Other	272	(363)
Changes in operating assets and liabilities:
Accounts receivable	22,507	15,060
Other receivables and current assets	6,167	18,203
Other long-term assets	1,189	6,046
Accounts payable, accrued expenses and current liabilities	(40,009)	(23,335)
Accrued income taxes	(1,807)	1,303
Deferred revenue	31,704	7,176
Other long-term liabilities	(583)	1,062
Net cash provided by operating activities	132,421	125,893
Cash flows from investing activities:
Acquisitions, net of cash acquired	0	(5,864)
Capital expenditures	(2,933)	(4,057)
Other investing activities	(4,303)	(964)
Net cash used in investing activities	(7,236)	(10,885)
Cash flows from financing activities:
Purchase of treasury stock	(117,831)	(100,352)
Restricted stock withholding taxes paid in lieu of issued shares	(24,333)	(8,480)
Proceeds from shares issued for stock-based compensation	12,759	30,498
Net cash used in financing activities	(129,405)	(78,334)
Effect of exchange rate fluctuations on cash and cash equivalents	8,212	7,035
Net increase in cash and cash equivalents	3,992	43,709
Cash and cash equivalents, beginning of period	881,501	822,479
Cash and cash equivalents, end of period	885,493	866,188
Supplemental disclosures of cash flow information:
Income taxes paid	$ 3,402	$ 2,376

Organization	3 Months Ended
Organization	Mar. 31, 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

3 Months Ended

Mar. 31, 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 months ended March 31, 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. The effect of the adoption of this standard will depend upon the nature of the Company's future acquisitions.

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 does not expect to early adopt 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 may materially increase the Company's assets and liabilities upon adoption. The Company has completed the initial inventory of its leases and policy elections, and expects that it will primarily have operating leases. The Company is currently developing 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.

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:



	March 31, 2018			December 31, 2017
(in thousands, except percentages)	Amount		% of Total	Amount		% of Total
Cash accounts	$	560,670	63.3	$	568,587	64.5
Money market funds	324,823		36.7	312,914		35.5
Total	$	885,493		$	881,501

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

Revenue from Contracts with Customers

3 Months Ended

Mar. 31, 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 the progress towards 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 substantially perform 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. Certain sales commissions associated with multi-year contracts are subject to an employee service requirement. As an action other than each party approving the contract is required to trigger these sales commissions, they are not considered incremental costs to obtain a contract and are expensed as incurred.

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 tables compare the reported condensed consolidated balance sheet and statement of income, as of and for the three months ended March 31, 2018, to the amounts had ASC 605 been in effect:



Condensed Consolidated Balance Sheet	As of March 31, 2018
(in thousands)	As Reported (ASC 606)		ASC 605		Change
Accounts receivable, less allowance for doubtful accounts of $6,800	$	256,560	$	113,585	$	142,975
Other receivables and current assets	181,001		269,175		(88,174		)
Deferred income tax assets	15,446		38,641		(23,195		)
Accrued income taxes	4,870		3,681		1,189
Other accrued expenses and liabilities	95,053		101,165		(6,112		)
Deferred revenue - current	311,718		471,676		(159,958		)
Deferred income tax liabilities	28,849		4,878		23,971
Other long-term liabilities	80,865		94,060		(13,195		)
Stockholders' equity	2,407,360		2,221,649		185,711

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, 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.



Condensed Consolidated Statement of Income	Three Months Ended March 31, 2018
(in thousands, except per share data)	As Reported (ASC 606)		ASC 605		Change
Revenue:
Software licenses	$	110,046	$	154,857	$	(44,811	)
Maintenance and service	172,827		129,712		43,115
Cost of sales:
Software licenses	3,911		8,146		(4,235		)
Maintenance and service	26,341		22,106		4,235
Income tax provision	12,758		12,981		(223		)
Earnings per share:
Basic	$	1.00	$	1.02	$	(0.02	)
Diluted	$	0.98	$	1.00	$	(0.02	)

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. The decrease to software licenses revenue was partially offset by the upfront recognition of lease license 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 were 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 an acceleration of 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 table summarizes revenue:



	Three Months Ended March 31,
(in thousands)	2018 (ASC 606)		2018 (ASC 605)		2017 (ASC 605)
Revenue:
Lease licenses	$	48,772	$	101,789	$	93,634
Perpetual licenses	61,274		53,068		48,274
Software licenses	110,046		154,857		141,908
Maintenance	163,896		120,762		104,406
Service	8,931		8,950		7,091
Maintenance and service	172,827		129,712		111,497
Total revenue	$	282,873	$	284,569	$	253,405

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 23.5% of its total revenue through the indirect sales channel for the three months ended March 31, 2018. Under ASC 605, the Company derived 22.9% and 24.4% of its total revenue through the indirect sales channel for the three months ended March 31, 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 term 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)	Three Months Ended March 31, 2018
Beginning balance – January 1	$	299,730
Recognition of deferred revenue	(282,873		)
Deferral of revenue	307,978
Currency translation	4,559
Ending balance – March 31	$	329,394

Revenue recognized during the three months ended March 31, 2018 from amounts included in deferred revenue at the beginning of the period was $145.8 million.

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. Total revenue allocated to remaining performance obligations was $595.0 million as of March 31, 2018 and will be recognized as revenue as follows:



(in thousands)
Next 12 months	$	438,650
Months 13-24	112,580
Months 25-36	40,016
Thereafter	3,763
Total revenue allocated to remaining performance obligations	$	595,009

Receivables and Other Current Assets

3 Months Ended

Mar. 31, 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)	March 31, 2018		December 31, 2017
Accounts receivable, less allowance for doubtful accounts of $6,800	$	256,560	$	124,659

Receivables related to unrecognized revenue	$	134,613	$	215,155
Income taxes receivable, including overpayments and refunds	13,921		21,663
Prepaid expenses and other current assets	32,467		27,002
Total other receivables and current assets	$	181,001	$	263,820

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

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

Earnings Per Share

3 Months Ended

Mar. 31, 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
(in thousands, except per share data)	March 31, 2018		March 31, 2017
Net income	$	84,280	$	63,306
Weighted average shares outstanding – basic	83,931		85,456
Dilutive effect of stock plans	2,221		1,768
Weighted average shares outstanding – diluted	86,152		87,224
Basic earnings per share	$	1.00	$	0.74
Diluted earnings per share	$	0.98	$	0.73
Anti-dilutive shares	—		309

Goodwill and Intangible Assets

3 Months Ended

Mar. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

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



	March 31, 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)	$	365,684	$	(303,026	)	$	365,317	$	(297,645	)
Customer lists and contract backlog (5 – 15 years)	173,250		(109,438		)	171,048		(104,522		)
Trade names (2 – 10 years)	127,315		(107,746		)	127,200		(104,130		)
Total	$	666,249	$	(520,210	)	$	663,565	$	(506,297	)
Indefinite-lived intangible asset:
Trade name	$	357				$	357

Amortization expense for the intangible assets reflected above was $12.2 million and $12.0 million for the three months ended March 31, 2018 and 2017, respectively.

As of March 31, 2018, estimated future amortization expense for the intangible assets reflected above is as follows:



(in thousands)
Remainder of 2018	$	27,146
2019	26,583
2020	25,674
2021	21,392
2022	16,282
2023	13,088
Thereafter	15,874
Total intangible assets subject to amortization	146,039
Indefinite-lived trade name	357
Other intangible assets, net	$	146,396

The changes in goodwill during the three months ended March 31, 2018 and 2017 were as follows:



(in thousands)	2018		2017
Beginning balance – January 1	$	1,378,553	$	1,337,215
Acquisitions	—		2,586
Currency translation and other	905		590
Ending balance – March 31	$	1,379,458	$	1,340,391

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 three months ended March 31, 2018 that would indicate that the fair values of the Company's reporting unit and indefinite-lived intangible asset are below their carrying amounts.

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Fair Value Measurement

3 Months Ended

Mar. 31, 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)	March 31, 2018		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Cash equivalents	$	324,823	$	324,823	$	—	$	—
Short-term investments	$	4,275	$	—	$	4,275	$	—
Deferred compensation plan investments	$	4,353	$	4,353	$	—	$	—



			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-affiliate independent 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	3 Months Ended
Income Taxes	Mar. 31, 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 $1.4 million to the transition tax obligation, with a corresponding adjustment of $1.4 million to tax expense, during the quarter ended March 31, 2018. A total transition tax obligation of $17.4 million has been recorded. Since the Company plans to elect to pay this liability over eight years, $15.8 million of the obligation is recorded in other long-term liabilities, with the balance recorded to accrued income taxes. 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 will allow 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 basis of the Company’s non-U.S. subsidiaries. The Company has not made any measurement-period adjustments related to its indefinite reinvestment assertion during the quarter ended March 31, 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 quarter ended March 31, 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 $27.8 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

3 Months Ended

Mar. 31, 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 March 31,
(in thousands)	2018 (ASC 606)		2018 (ASC 605)		2017 (ASC 605)
United States	$	98,765	$	108,586	$	99,768
Germany	45,538		33,389		25,116
Japan	30,601		34,412		31,472
France	16,552		15,796		12,190
South Korea	15,054		15,555		13,669
Other Europe, Middle East and Africa (EMEA)	43,018		42,484		36,539
Other international	33,345		34,347		34,651
Total revenue	$	282,873	$	284,569	$	253,405

Property and equipment by geographic area is as follows:



(in thousands)	March 31, 2018		December 31, 2017
United States	$	44,469	$	45,498
EMEA	5,162		5,114
India	3,497		3,704
Other international	2,678		2,780
Total property and equipment, net	$	55,806	$	57,096

Stock-Based Compensation

3 Months Ended

Mar. 31, 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
(in thousands, except per share data)	March 31, 2018			March 31, 2017
Cost of sales:
Software licenses	$	—		$	250
Maintenance and service	1,010			426
Operating expenses:
Selling, general and administrative	8,278			5,956
Research and development	5,981			3,881
Stock-based compensation expense before taxes	15,269			10,513
Related income tax benefits	(11,304		)	(10,421		)
Stock-based compensation expense, net of taxes	$	3,965		$	92
Net impact on earnings per share:
Basic earnings per share	$	(0.05	)	$	—
Diluted earnings per share	$	(0.05	)	$	—

Stock Repurchase Program

3 Months Ended

Mar. 31, 2018

Class of Stock Disclosures [Abstract]

Stock Repurchase Program

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



	Three Months Ended
(in thousands, except per share data)	March 31, 2018		March 31, 2017
Number of shares repurchased	750		1,000
Average price paid per share	$	157.11	$	100.35
Total cost	$	117,831	$	100,352

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 March 31, 2018, 4.8 million shares remained available for repurchase under the program.

Restructuring

3 Months Ended

Mar. 31, 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	3 Months Ended
Contingencies and Commitments	Mar. 31, 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 $7.4 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) has passed a favorable ruling to Microsoft. The Company can provide no assurances on whether the Microsoft case’s favorable ruling will be challenged in higher courts or 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 March 31, 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.

Subsequent Event	3 Months Ended
Subsequent Event	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event In May 2018, the Company acquired OPTIS, a premier provider of software for scientific simulation of light, human vision and physics-based visualization, for a purchase price of approximately $300 million in cash. The acquisition will extend the Company's portfolio into the area of optical simulation to further its solutions for autonomous vehicles. The acquisition met the definition of a business under ASU 2017-01.

Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Basis of Presentation

Changes in Accounting Policies

Accounting Guidance Issued and Not Yet Adopted

Cash and Cash Equivalents



	March 31, 2018			December 31, 2017
(in thousands, except percentages)	Amount		% of Total	Amount		% of Total
Cash accounts	$	560,670	63.3	$	568,587	64.5
Money market funds	324,823		36.7	312,914		35.5
Total	$	885,493		$	881,501

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

Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Cash and Cash Equivalents

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



	March 31, 2018			December 31, 2017
(in thousands, except percentages)	Amount		% of Total	Amount		% of Total
Cash accounts	$	560,670	63.3	$	568,587	64.5
Money market funds	324,823		36.7	312,914		35.5
Total	$	885,493		$	881,501

Revenue from Contracts with Customers (Tables)

3 Months Ended

Mar. 31, 2018

Revenue from Contract with Customer [Abstract]

Impact of ASC 606 on Condensed Consolidated Financial Statement Line Items

The following tables compare the reported condensed consolidated balance sheet and statement of income, as of and for the three months ended March 31, 2018, to the amounts had ASC 605 been in effect:



Condensed Consolidated Balance Sheet	As of March 31, 2018
(in thousands)	As Reported (ASC 606)		ASC 605		Change
Accounts receivable, less allowance for doubtful accounts of $6,800	$	256,560	$	113,585	$	142,975
Other receivables and current assets	181,001		269,175		(88,174		)
Deferred income tax assets	15,446		38,641		(23,195		)
Accrued income taxes	4,870		3,681		1,189
Other accrued expenses and liabilities	95,053		101,165		(6,112		)
Deferred revenue - current	311,718		471,676		(159,958		)
Deferred income tax liabilities	28,849		4,878		23,971
Other long-term liabilities	80,865		94,060		(13,195		)
Stockholders' equity	2,407,360		2,221,649		185,711



Condensed Consolidated Statement of Income	Three Months Ended March 31, 2018
(in thousands, except per share data)	As Reported (ASC 606)		ASC 605		Change
Revenue:
Software licenses	$	110,046	$	154,857	$	(44,811	)
Maintenance and service	172,827		129,712		43,115
Cost of sales:
Software licenses	3,911		8,146		(4,235		)
Maintenance and service	26,341		22,106		4,235
Income tax provision	12,758		12,981		(223		)
Earnings per share:
Basic	$	1.00	$	1.02	$	(0.02	)
Diluted	$	0.98	$	1.00	$	(0.02	)

Disaggregation of Revenue

The following table summarizes revenue:



	Three Months Ended March 31,
(in thousands)	2018 (ASC 606)		2018 (ASC 605)		2017 (ASC 605)
Revenue:
Lease licenses	$	48,772	$	101,789	$	93,634
Perpetual licenses	61,274		53,068		48,274
Software licenses	110,046		154,857		141,908
Maintenance	163,896		120,762		104,406
Service	8,931		8,950		7,091
Maintenance and service	172,827		129,712		111,497
Total revenue	$	282,873	$	284,569	$	253,405

Changes in Deferred Revenue

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



(in thousands)	Three Months Ended March 31, 2018
Beginning balance – January 1	$	299,730
Recognition of deferred revenue	(282,873		)
Deferral of revenue	307,978
Currency translation	4,559
Ending balance – March 31	$	329,394

Remaining Performance Obligations, Expected Timing of Satisfaction

Total revenue allocated to remaining performance obligations was $595.0 million as of March 31, 2018 and will be recognized as revenue as follows:



(in thousands)
Next 12 months	$	438,650
Months 13-24	112,580
Months 25-36	40,016
Thereafter	3,763
Total revenue allocated to remaining performance obligations	$	595,009

Receivables and Other Current Assets (Tables)

3 Months Ended

Mar. 31, 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)	March 31, 2018		December 31, 2017
Accounts receivable, less allowance for doubtful accounts of $6,800	$	256,560	$	124,659

Receivables related to unrecognized revenue	$	134,613	$	215,155
Income taxes receivable, including overpayments and refunds	13,921		21,663
Prepaid expenses and other current assets	32,467		27,002
Total other receivables and current assets	$	181,001	$	263,820

Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Details of Basic and Diluted EPS

The details of basic and diluted EPS are as follows:



	Three Months Ended
(in thousands, except per share data)	March 31, 2018		March 31, 2017
Net income	$	84,280	$	63,306
Weighted average shares outstanding – basic	83,931		85,456
Dilutive effect of stock plans	2,221		1,768
Weighted average shares outstanding – diluted	86,152		87,224
Basic earnings per share	$	1.00	$	0.74
Diluted earnings per share	$	0.98	$	0.73
Anti-dilutive shares	—		309

Goodwill and Intangible Assets (Tables)

3 Months Ended

Mar. 31, 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:



	March 31, 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)	$	365,684	$	(303,026	)	$	365,317	$	(297,645	)
Customer lists and contract backlog (5 – 15 years)	173,250		(109,438		)	171,048		(104,522		)
Trade names (2 – 10 years)	127,315		(107,746		)	127,200		(104,130		)
Total	$	666,249	$	(520,210	)	$	663,565	$	(506,297	)
Indefinite-lived intangible asset:
Trade name	$	357				$	357

Estimated Future Amortization Expense for Intangible Assets

As of March 31, 2018, estimated future amortization expense for the intangible assets reflected above is as follows:



(in thousands)
Remainder of 2018	$	27,146
2019	26,583
2020	25,674
2021	21,392
2022	16,282
2023	13,088
Thereafter	15,874
Total intangible assets subject to amortization	146,039
Indefinite-lived trade name	357
Other intangible assets, net	$	146,396

Changes in Goodwill

The changes in goodwill during the three months ended March 31, 2018 and 2017 were as follows:



(in thousands)	2018		2017
Beginning balance – January 1	$	1,378,553	$	1,337,215
Acquisitions	—		2,586
Currency translation and other	905		590
Ending balance – March 31	$	1,379,458	$	1,340,391

Fair Value Measurement (Tables)

3 Months Ended

Mar. 31, 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)	March 31, 2018		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Cash equivalents	$	324,823	$	324,823	$	—	$	—
Short-term investments	$	4,275	$	—	$	4,275	$	—
Deferred compensation plan investments	$	4,353	$	4,353	$	—	$	—



			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)

3 Months Ended

Mar. 31, 2018

Segments, Geographical Areas [Abstract]

Revenue by Geographic Area

Revenue by geographic area is as follows:



	Three Months Ended March 31,
(in thousands)	2018 (ASC 606)		2018 (ASC 605)		2017 (ASC 605)
United States	$	98,765	$	108,586	$	99,768
Germany	45,538		33,389		25,116
Japan	30,601		34,412		31,472
France	16,552		15,796		12,190
South Korea	15,054		15,555		13,669
Other Europe, Middle East and Africa (EMEA)	43,018		42,484		36,539
Other international	33,345		34,347		34,651
Total revenue	$	282,873	$	284,569	$	253,405

Property and Equipment by Geographic Area

Property and equipment by geographic area is as follows:



(in thousands)	March 31, 2018		December 31, 2017
United States	$	44,469	$	45,498
EMEA	5,162		5,114
India	3,497		3,704
Other international	2,678		2,780
Total property and equipment, net	$	55,806	$	57,096

Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 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
(in thousands, except per share data)	March 31, 2018			March 31, 2017
Cost of sales:
Software licenses	$	—		$	250
Maintenance and service	1,010			426
Operating expenses:
Selling, general and administrative	8,278			5,956
Research and development	5,981			3,881
Stock-based compensation expense before taxes	15,269			10,513
Related income tax benefits	(11,304		)	(10,421		)
Stock-based compensation expense, net of taxes	$	3,965		$	92
Net impact on earnings per share:
Basic earnings per share	$	(0.05	)	$	—
Diluted earnings per share	$	(0.05	)	$	—

Stock Repurchase Program (Tables)

3 Months Ended

Mar. 31, 2018

Class of Stock Disclosures [Abstract]

Stock Repurchase Program

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



	Three Months Ended
(in thousands, except per share data)	March 31, 2018		March 31, 2017
Number of shares repurchased	750		1,000
Average price paid per share	$	157.11	$	100.35
Total cost	$	117,831	$	100,352

Restructuring (Tables)

3 Months Ended

Mar. 31, 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)	3 Months Ended
Organization - Additional Information (Detail)	Mar. 31, 2018 Segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of operating segments	1

Cash and Cash Equivalents (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Cash accounts, Amount	$ 560,670	$ 568,587
Money market funds, Amount	324,823	312,914
Total	$ 885,493	$ 881,501	$ 866,188	$ 822,479
Cash accounts, % of Total	63.32%	64.50%
Money market funds, % of Total	36.68%	35.50%

Accounting Policies - Additional Information (Detail)	3 Months Ended
Accounting Policies - Additional Information (Detail)	Mar. 31, 2018	Mar. 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		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2018
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%
Percent of Revenue from Indirect Sales	23.50%	24.40%
Amount of Revenue Recognized From Beginning Deferred Revenue	$ 145,800
Revenue, Remaining Performance Obligation	595,009
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
Previous Accounting Guidance
Percent of Revenue from Indirect Sales	22.90%

Impact of ASC 606 on Condensed Consolidated Financial Statement Line Items (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Accounts receivable, less allowance for doubtful accounts of $6,800	$ 256,560		$ 124,659
Other receivables and current assets	181,001		263,820
Deferred income tax assets	15,446		42,111
Accrued income taxes	4,870		5,760
Other accrued expenses and liabilities	95,053		86,335
Deferred revenue - current	311,718		440,491
Deferred income tax liabilities	28,849		1,461
Other long-term liabilities	80,865		85,778
Stockholders' equity	2,407,360		$ 2,245,831
Software licenses	110,046	$ 141,908
Maintenance and service	172,827	111,497
Software licenses	3,911	9,277
Maintenance and service	26,341	18,818
Income tax provision	$ 12,758	$ 22,261
Basic earnings per share	$ 1.00	$ 0.74
Diluted earnings per share	$ 0.98	$ 0.73
Previous Accounting Guidance
Accounts receivable, less allowance for doubtful accounts of $6,800	$ 113,585
Other receivables and current assets	269,175
Deferred income tax assets	38,641
Accrued income taxes	3,681
Other accrued expenses and liabilities	101,165
Deferred revenue - current	471,676
Deferred income tax liabilities	4,878
Other long-term liabilities	94,060
Stockholders' equity	2,221,649
Software licenses	154,857
Maintenance and service	129,712
Software licenses	8,146
Maintenance and service	22,106
Income tax provision	$ 12,981
Basic earnings per share	$ 1.02
Diluted earnings per share	$ 1.00
Adjustments for New Accounting Pronouncement
Accounts receivable, less allowance for doubtful accounts of $6,800	$ 142,975
Other receivables and current assets	(88,174)
Deferred income tax assets	(23,195)
Accrued income taxes	1,189
Other accrued expenses and liabilities	(6,112)
Deferred revenue - current	(159,958)
Deferred income tax liabilities	23,971
Other long-term liabilities	(13,195)
Stockholders' equity	185,711
Software licenses	(44,811)
Maintenance and service	43,115
Software licenses	(4,235)
Maintenance and service	4,235
Income tax provision	$ (223)
Basic earnings per share	$ (0.02)
Diluted earnings per share	$ (0.02)

Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Software licenses	$ 110,046	$ 141,908
Maintenance and service	172,827	111,497
Total revenue	282,873	253,405
Lease License Revenue
Software licenses	48,772	93,634
Perpetual License Revenue
Software licenses	61,274	48,274
Maintenance Revenue
Maintenance and service	163,896	104,406
Service Revenue
Maintenance and service	8,931	$ 7,091
Previous Accounting Guidance
Software licenses	154,857
Maintenance and service	129,712
Total revenue	284,569
Previous Accounting Guidance \| Lease License Revenue
Software licenses	101,789
Previous Accounting Guidance \| Perpetual License Revenue
Software licenses	53,068
Previous Accounting Guidance \| Maintenance Revenue
Maintenance and service	120,762
Previous Accounting Guidance \| Service Revenue
Maintenance and service	$ 8,950

Changes in Deferred Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Movement in Deferred Revenue [Roll Forward]
Recognition of deferred revenue	$ (282,873)	$ (253,405)
Deferral of revenue	307,978
Currency translation	4,559
Ending balance	329,394
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	3 Months Ended
	Mar. 31, 2018 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	$ 595,009
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	$ 438,650
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	$ 112,580
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	$ 40,016
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	$ 3,763
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	7 years

Schedule of Receivables and Other Current Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accounts receivable, less allowance for doubtful accounts of $6,800	$ 256,560	$ 124,659
Other receivables and current assets	181,001	263,820
Deferred Accounts Receivable Current Portion Of Lease Licenses And Software Maintenance [Member]
Other receivables and current assets	134,613	215,155
Taxes Receivable Related To Overpayments And Refunds [Member]
Other receivables and current assets	13,921	21,663
Prepaid Expenses and Other Current Assets [Member]
Other receivables and current assets	$ 32,467	$ 27,002

Receivables and Other Current Assets - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, less allowance for doubtful accounts of $6,800	$ 256,560	$ 124,659
Other receivables and current assets	181,001	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 $6,800		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	$ 134,613	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
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net income	$ 84,280	$ 63,306
Weighted average shares outstanding - basic	83,931	85,456
Dilutive effect of stock plans	2,221	1,768
Weighted average shares outstanding - diluted	86,152	87,224
Basic earnings per share	$ 1.00	$ 0.74
Diluted earnings per share	$ 0.98	$ 0.73
Anti-dilutive shares	0	309

Intangible Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Intangible Assets [Line Items]
Amortized intangible assets, gross carrying amount	$ 666,249	$ 663,565
Amortized intangible assets, accumulated amortization	(520,210)	(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	365,684	365,317
Amortized intangible assets, accumulated amortization	(303,026)	(297,645)
Customer Lists and Contract Backlog
Intangible Assets [Line Items]
Amortized intangible assets, gross carrying amount	173,250	171,048
Amortized intangible assets, accumulated amortization	(109,438)	(104,522)
Trade Names
Intangible Assets [Line Items]
Amortized intangible assets, gross carrying amount	127,315	127,200
Amortized intangible assets, accumulated amortization	$ (107,746)	$ (104,130)

Estimated Useful Lives (Detail)	3 Months Ended
Estimated Useful Lives (Detail)	Mar. 31, 2018
Minimum \| Developed Software and Core Technologies
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	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	2 years
Maximum \| Developed Software and Core Technologies
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	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

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization	$ 12,221	$ 12,043

Estimated Future Amortization Expense for Intangible Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2018	$ 27,146
2019	26,583
2020	25,674
2021	21,392
2022	16,282
2023	13,088
Thereafter	15,874
Total intangible assets subject to amortization	146,039
Indefinite-lived intangible assets (excluding goodwill)	357
Other intangible assets, net	$ 146,396	$ 157,625

Changes in Goodwill (Detail) - USD ($) $ in Thousands	3 Months Ended
Changes in Goodwill (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Goodwill [Roll Forward]
Beginning balance	$ 1,378,553	$ 1,337,215
Acquisitions	0	2,586
Currency translation and other	905	590
Ending balance	$ 1,379,458	$ 1,340,391

Fair Value of Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 324,823	$ 312,914
Short-term investments	4,275	286
Deferred compensation plan investments	4,353	3,742
Quoted Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	324,823	312,914
Short-term investments	0	0
Deferred compensation plan investments	4,353	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	4,275	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

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References + Details

Fair Value Measurement - Additional Information (Detail)	3 Months Ended
	Mar. 31, 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	6 Months Ended	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Transition Tax, Amount	$ 1,400	$ 17,400	$ 16,000
Accrued Income Taxes, Noncurrent	15,800	15,800
Unrecognized Tax Benefits	$ 27,800	$ 27,800

Revenue by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 282,873	$ 253,405
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	98,765	99,768
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	45,538	25,116
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	30,601	31,472
France
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	16,552	12,190
South Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	15,054	13,669
Other EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	43,018	36,539
Other international
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	33,345	$ 34,651
Previous Accounting Guidance
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	284,569
Previous Accounting Guidance \| United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	108,586
Previous Accounting Guidance \| Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	33,389
Previous Accounting Guidance \| Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	34,412
Previous Accounting Guidance \| France
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	15,796
Previous Accounting Guidance \| South Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	15,555
Previous Accounting Guidance \| Other EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	42,484
Previous Accounting Guidance \| Other international
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 34,347

Property and Equipment by Geographic Area (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	$ 55,806	$ 57,096
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	44,469	45,498
EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	5,162	5,114
India
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	3,497	3,704
Other international
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	$ 2,678	$ 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
	Mar. 31, 2018	Mar. 31, 2017
Employee Service Share-Based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	$ 15,269	$ 10,513
Related income tax benefits	(11,304)	(10,421)
Stock-based compensation expense, net of taxes	$ 3,965	$ 92
Basic earnings per share	$ (0.05)	$ 0.00
Diluted earnings per share	$ (0.05)	$ 0.00
Software Licenses
Employee Service Share-Based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	$ 0	$ 250
Maintenance and Service
Employee Service Share-Based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	1,010	426
Selling, General and Administrative
Employee Service Share-Based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	8,278	5,956
Research and Development
Employee Service Share-Based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	$ 5,981	$ 3,881

Stock Repurchase Program (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Class of Stock Disclosures [Abstract]
Number of shares repurchased	750	1,000
Average price paid per share	$ 157.11	$ 100.35
Total cost	$ 117,831	$ 100,352

Stock Repurchase Program - Additional Information (Detail) shares in Thousands	Mar. 31, 2018 shares
Class of Stock Disclosures [Abstract]
Stock repurchase program, repurchase authorization	5,000
Stock repurchase program, remaining number of shares authorized to be repurchased	4,750

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	Mar. 31, 2018 USD ($)
India Service Tax Audit [Member]
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss	$ 7.4

Subsequent Event - Additional Information (Detail) $ in Thousands	May 02, 2018 USD ($)
Subsequent Event
Subsequent Event [Line Items]
Business Combination, Consideration Transferred	$ 300,000