Fair Isaac (FICO) 10-K 9 Nov 18 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Sep. 30, 2018	Oct. 26, 2018	Mar. 31, 2018
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Trading Symbol	FICO
Entity Registrant Name	FAIR ISAAC CORP
Entity Central Index Key	814,547
Current Fiscal Year End Date	--09-30
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		28,955,028
Entity Small Business	false
Entity Public Float			$ 3,548,843,145
Entity Emerging Growth Company	false
Entity Shell Company	false

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Current assets:
Cash and cash equivalents	$ 90,023	$ 105,618
Accounts receivable, net	208,865	168,586
Prepaid expenses and other current assets	39,624	36,727
Total current assets	338,512	310,931
Marketable securities	18,059	13,791
Other investments	1,697	11,724
Property and equipment, net	48,837	40,703
Goodwill	800,890	804,414
Intangible assets, net	14,536	21,185
Deferred income taxes	20,117	47,204
Other assets	12,431	5,668
Total assets	1,255,079	1,255,620
Current liabilities:
Accounts payable	20,251	19,510
Accrued compensation and employee benefits	84,292	77,610
Other accrued liabilities	30,457	32,104
Deferred revenue	52,215	55,431
Current maturities on debt	235,000	142,000
Total current liabilities	422,215	326,655
Long-term debt	528,944	462,801
Other liabilities	40,183	39,627
Total liabilities	991,342	829,083
Commitments and contingencies
Stockholders’ equity:
Preferred stock ($0.01 par value; 1,000 shares authorized; none issued and outstanding)	0	0
Common stock ($0.01 par value; 200,000 shares authorized, 88,857 shares issued and 29,015 and 30,243 shares outstanding at September 30, 2018 and September 30, 2017, respectively)	290	302
Paid-in-capital	1,211,051	1,195,431
Treasury stock, at cost (59,842 and 58,614 shares at September 30, 2018 and September 30, 2017, respectively)	(2,612,007)	(2,301,097)
Retained earnings	1,740,810	1,598,395
Accumulated other comprehensive loss	(76,407)	(66,494)
Total stockholders’ equity	263,737	426,537
Total liabilities and stockholders’ equity	$ 1,255,079	$ 1,255,620

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Sep. 30, 2018	Sep. 30, 2017
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	88,857,000	88,857,000
Common stock, shares outstanding (in shares)	29,015,000	30,243,000
Treasury stock, shares	59,842,000	58,614,000

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Revenues
Revenues		$ 1,032,475	$ 932,169	$ 881,356
Operating expenses:
Cost of revenues	[1]	310,699	287,123	265,173
Research and development		128,383	110,870	103,669
Selling, general and administrative	[1]	380,362	339,796	328,940
Amortization of intangible assets	[1]	6,594	12,709	13,982
Restructuring and acquisition-related		0	4,471	0
Total operating expenses		826,038	754,969	711,764
Operating income		206,437	177,200	169,592
Interest expense, net		(31,311)	(25,790)	(26,633)
Other income (expense), net		12,884	(86)	1,610
Income before income taxes		188,010	151,324	144,569
Provision for income taxes		45,595	23,068	35,121
Net income		142,415	128,256	109,448
Other comprehensive income (loss):
Foreign currency translation adjustments		(9,913)	10,517	(26,296)
Comprehensive income		$ 132,502	$ 138,773	$ 83,152
Basic earnings per share (in dollars per share)		$ 4.79	$ 4.16	$ 3.52
Shares used in computing basic earnings per share (in shares)		29,711	30,862	31,129
Diluted earnings per share (in dollars per share)		$ 4.57	$ 3.98	$ 3.39
Shares used in computing diluted earnings per share (in shares)		31,180	32,245	32,308
Transactional and maintenance
Revenues
Revenues		$ 766,059	$ 652,660	$ 605,919
Professional services
Revenues
Revenues		176,804	179,569	169,738
License
Revenues
Revenues		$ 89,612	$ 99,940	$ 105,699
[1]	Cost of revenues and selling, general and administrative expenses exclude the amortization of intangible assets. See Note 7.

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Paid-in- Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance (in shares) at Sep. 30, 2015		31,290
Beginning Balance at Sep. 30, 2015	$ 436,998	$ 313	$ 1,156,626	$ (2,033,644)	$ 1,364,418	$ (50,715)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	55,509		55,509
Issuance of treasury stock under employee stock plans (in shares)		980
Issuance of treasury stock under employee stock plans	(12,127)	$ 10	(47,406)	35,269
Tax effect from share-based payment arrangements	24,184		24,184
Repurchases of common stock (in shares)		(1,335)
Repurchases of common stock	(138,399)	$ (14)		(138,385)
Dividends paid	(2,489)				(2,489)
Net income	109,448				109,448
Foreign currency translation adjustments	(26,296)					(26,296)
Ending Balance (in shares) at Sep. 30, 2016		30,935
Ending Balance at Sep. 30, 2016	446,828	$ 309	1,188,913	(2,136,760)	1,471,377	(77,011)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	61,222		61,222
Issuance of treasury stock under employee stock plans (in shares)		774
Issuance of treasury stock under employee stock plans	(25,758)	$ 8	(54,704)	28,938
Repurchases of common stock (in shares)		(1,466)
Repurchases of common stock	(193,290)	$ (15)		(193,275)
Dividends paid	(1,238)				(1,238)
Net income	128,256				128,256
Foreign currency translation adjustments	10,517					10,517
Ending Balance (in shares) at Sep. 30, 2017		30,243
Ending Balance at Sep. 30, 2017	426,537	$ 302	1,195,431	(2,301,097)	1,598,395	(66,494)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	74,814		74,814
Issuance of treasury stock under employee stock plans (in shares)		633
Issuance of treasury stock under employee stock plans	(33,181)	$ 7	(59,194)	26,006
Repurchases of common stock (in shares)		(1,861)
Repurchases of common stock	(336,935)	$ (19)		(336,916)
Net income	142,415				142,415
Foreign currency translation adjustments	(9,913)					(9,913)
Ending Balance (in shares) at Sep. 30, 2018		29,015
Ending Balance at Sep. 30, 2018	$ 263,737	$ 290	$ 1,211,051	$ (2,612,007)	$ 1,740,810	$ (76,407)

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Statement of Cash Flows [Abstract]
Proceeds from Sale and Maturity of Other Investments	$ 20,000	$ 0	$ 0
Cash flows from operating activities:
Net income	142,415	128,256	109,448
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	30,182	36,214	31,633
Share-based compensation	74,814	61,222	55,509
Deferred income taxes	25,729	(6,049)	(26,007)
Tax effect from share-based payment arrangements	0	0	24,184
Provision of doubtful accounts	623	1,640	2,011
Net gain on marketable securities	(1,449)	0	0
Gain on sale of cost-method investment	(10,000)	0	0
Net loss on sales of property and equipment	231	14	6
Changes in operating assets and liabilities:
Accounts receivable	(42,403)	(1,265)	(18,225)
Prepaid expenses and other assets	(8,504)	(7,115)	12,848
Accounts payable	843	(2,027)	564
Accrued compensation and employee benefits	7,352	6,464	17,079
Other liabilities	6,416	(683)	(4,282)
Deferred revenue	(3,197)	8,973	5,500
Net cash provided by operating activities	223,052	225,644	210,268
Cash flows from investing activities:
Purchases of property and equipment	(31,299)	(19,828)	(21,969)
Proceeds from sales of marketable securities	3,230	0	0
Purchases of marketable securities	(6,050)	0	0
Cash paid for acquisitions, net of cash acquired	0	0	(5,683)
Distribution from (purchase of) cost-method investment	0	(777)	37
Net cash used in investing activities	(14,119)	(20,605)	(27,615)
Cash flows from financing activities:
Proceeds from revolving line of credit	427,000	190,000	122,000
Payments on revolving line of credit	(531,000)	(84,000)	(99,000)
Proceeds from issuance of senior notes	400,000	0	0
Payments on senior notes	(131,000)	(72,000)	(60,000)
Payments on debt issuance costs	(7,849)	0	0
Proceeds from issuance of treasury stock under employee stock plans	11,023	14,474	17,828
Taxes paid related to net share settlement of equity awards	(44,205)	(40,232)	(29,955)
Dividends paid	0	(1,238)	(2,489)
Repurchases of common stock	(342,596)	(187,629)	(138,399)
Net cash used in financing activities	(218,627)	(180,625)	(190,015)
Effect of exchange rate changes on cash	(5,901)	5,278	(2,832)
Increase (decrease) in cash and cash equivalents	(15,595)	29,692	(10,194)
Cash and cash equivalents, beginning of year	105,618	75,926	86,120
Cash and cash equivalents, end of year	90,023	105,618	75,926
Supplemental disclosures of cash flow information:
Cash paid for income taxes, net of refunds of $3,079, $3,757 and $11,363 during the years ended September 30, 2018, 2017 and 2016, respectively	13,398	31,315	10,855
Cash paid for interest	26,106	26,083	26,884
Supplemental disclosures of non-cash investing and financing activities:
Unsettled repurchases of common stock	0	5,661	0
Purchase of property and equipment included in accounts payable	$ 1,913	$ 1,751	$ 3,287

CONSOLIDATED STATEMENTS OF CA_2

CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Statement of Cash Flows [Abstract]
Cash paid for income taxes, refunds	$ 3,079	$ 3,757	$ 11,363

Nature of Business and Summary

Nature of Business and Summary of Significant Accounting Policies	12 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Nature of Business and Summary of Significant Accounting Policies	Nature of Business and Summary of Significant Accounting Policies Fair Isaac Corporation Incorporated under the laws of the State of Delaware, Fair Isaac Corporation (“FICO”) is a provider of analytic, software and data management products and services that enable businesses to automate, improve and connect decisions. FICO provides a range of analytical solutions, credit scoring and credit account management products and services to banks, credit reporting agencies, credit card processing agencies, insurers, retailers, healthcare organizations and public agencies. In these consolidated financial statements, FICO is referred to as “we,” “us,” “our,” or “the Company.” Principles of Consolidation and Basis of Presentation The consolidated financial statements include the accounts of FICO and its subsidiaries. All intercompany accounts and transactions have been eliminated. Use of Estimates We make estimates and assumptions that affect the amounts reported in the financial statements and the disclosures made in the accompanying notes. For example, we use estimates in determining the collectibility of accounts receivable; the appropriate levels of various accruals; labor hours in connection with fixed-fee service contracts; the amount of our tax provision and the realizability of deferred tax assets. We also use estimates in determining the remaining economic lives and carrying values of acquired intangible assets, property and equipment, and other long-lived assets. In addition, we use assumptions to estimate the fair value of reporting units and share-based compensation. Actual results may differ from our estimates. Cash and Cash Equivalents Cash and cash equivalents consist of cash in banks and investments with an original maturity of 90 days or less at time of purchase. Fair Value of Financial Instruments The fair value of certain of our financial instruments, including cash and cash equivalents, receivables, other current assets, accounts payable, accrued compensation and employee benefits, other accrued liabilities and amounts outstanding under our revolving line of credit, approximate their carrying amounts because of the short-term maturity of these instruments. The fair values of our cash and cash equivalents and marketable security investments are disclosed in Note 4. The fair value of our derivative instruments is disclosed in Note 5. The fair value of our senior notes is disclosed in Note 10. Investments We categorize our investments in debt and equity instruments as trading, available-for-sale or held-to-maturity at the time of purchase. Trading securities are carried at fair value with unrealized gains or losses included in income (expense). Available-for-sale securities are carried at fair value measurements using quoted prices in active markets for identical assets or liabilities with unrealized gains or losses included in accumulated other comprehensive income (loss). Held-to-maturity securities are carried at amortized cost. Dividends and interest income are accrued as earned. Realized gains and losses are determined on a specific identification basis and are included in other income (expense). We review marketable securities for impairment whenever circumstances and situations change such that there is an indication that the carrying amounts may not be recovered. We did not classify any securities as held-to-maturity during each of the three years ended September 30, 2018. Investments with remaining maturities over one year are classified as long-term investments. Our investments in equity securities of companies over which we do not have significant influence are accounted for under the cost method. The investment is originally recorded at cost and adjusted for additional contributions or distributions. Management periodically reviews cost-method investments for instances where fair value is less than the carrying amount and the decline in value is determined to be other than temporary. If the decline in value is judged to be other than temporary, the carrying amount of the security is written down to fair value and the resulting loss is charged to operations. We currently do not have investments in which we own 20% to 50% and exercise significant influence over operating and financial policies, therefore we do not account for any investment under the equity method. Concentration of Risk Financial instruments that potentially expose us to concentrations of risk consist primarily of cash and cash equivalents, marketable securities and accounts receivable, which are generally not collateralized. Our policy is to place our cash, cash equivalents, and marketable securities with high quality financial institutions, commercial corporations and government agencies in order to limit the amount of credit exposure. We have established guidelines relative to diversification and maturities for maintaining safety and liquidity. We generally do not require collateral from our customers, but our credit extension and collection policies include analyzing the financial condition of potential customers, establishing credit limits, monitoring payments, and aggressively pursuing delinquent accounts. We maintain allowances for potential credit losses. A significant portion of our revenues are derived from the sales of products and services to the consumer credit and banking industries. Property and Equipment Property and equipment are recorded at cost less accumulated depreciation and amortization. Major renewals and improvements are capitalized, while repair and maintenance costs are expensed as incurred. Depreciation and amortization charges are calculated using the straight-line method over the following estimated useful lives: Estimated Useful Life Data processing equipment and software 3 to 6 years Office furniture and equipment 3 to 7 years Leasehold improvements Shorter of estimated useful life or lease term The cost and accumulated depreciation for property and equipment sold, retired or otherwise disposed of are removed from the applicable accounts and resulting gains or losses are recorded in our consolidated statements of income and comprehensive income. Depreciation and amortization on property and equipment totaled $22.6 million , $23.0 million and $17.7 million during fiscal 2018, 2017 and 2016 , respectively. Internal-Use Software Costs incurred to develop internal-use software during the application development stage are capitalized and reported at cost. Application development stage costs generally include costs associated with internal-use software configuration, coding, installation and testing. Costs of significant upgrades and enhancements that result in additional functionality are also capitalized whereas costs incurred for maintenance and minor upgrades and enhancements are expensed as incurred. Capitalized costs are amortized using the straight-line method over two to three years. Software development costs required to be capitalized for internal-use software have not been material to date. Capitalized Software and Research and Development Costs Software development costs relating to products to be sold in the normal course of business are expensed as incurred as research and development costs until technological feasibility is established. Technological feasibility for our products occurs approximately concurrently with the general release of our products; accordingly, we have not capitalized any development or production costs. Costs we incur to maintain and support our existing products after the general release of the product are expensed in the period they are incurred and included in research and development costs in our consolidated statements of income and comprehensive income. Goodwill, Acquisition Intangibles and Other Long-Lived Assets Goodwill represents the excess of cost over the fair value of identifiable assets acquired and liabilities assumed in business combinations. We assess goodwill for impairment for each of our reporting units on an annual basis during the fourth quarter using a July 1 measurement date unless circumstances require a more frequent measurement. We have determined that our reporting units are the same as our reportable segments. When evaluating goodwill for impairment, we may first perform an assessment qualitatively whether it is more likely than not that a reporting unit's carrying amount exceeds its fair value, referred to as a “step zero” approach. If, based on the review of the qualitative factors, we determine it is not more likely than not that the fair value of a reporting unit is less than its carrying value, we would bypass the two-step impairment test. Events and circumstances we consider in performing the “step zero” qualitative assessment include macro-economic conditions, market and industry conditions, internal cost factors, share price fluctuations, and the operational stability and the overall financial performance of the reporting units. If we conclude that it is more likely than not that a reporting unit's fair value is less than its carrying amount, we would perform the first step (“step one”) of the two-step impairment test and calculate the estimated fair value of the reporting unit by using discounted cash flow valuation models and by comparing our reporting units to guideline publicly-traded companies. These methods require estimates of our future revenues, profits, capital expenditures, working capital, and other relevant factors, as well as selecting appropriate guideline publicly-traded companies for each reporting unit. We estimate these amounts by evaluating historical trends, current budgets, operating plans, industry data, and other relevant factors. Alternatively, we may bypass the qualitative assessment described above for any reporting unit in any period and proceed directly to performing step one of the goodwill impairment test. For fiscal 2018 and 2016, we performed a step zero qualitative analysis for our annual assessment of goodwill impairment. After evaluating and weighing all relevant events and circumstances, we concluded that it is not more likely than not that the fair value of any of our reporting units was less their carrying amounts, and did not perform a step one quantitative analysis. For fiscal 2017, we elected to proceed directly to the step one quantitative analysis for all of our reporting units, and determined goodwill was not impaired for any of our reporting units as there was a substantial excess of fair value over carrying value for each of our reporting units. Consequently, we did not recognize any goodwill impairment charges in fiscal 2018, 2017 or 2016. We amortize our finite-lived intangible assets which result from our acquisitions over the following estimated useful lives: Estimated Useful Life Completed technology 4 to 10 years Customer contracts and relationships 5 to 15 years Trade names 3 years Our intangible assets that have finite useful lives and other long-lived assets are assessed for potential impairment when there is evidence that events and circumstances related to our financial performance and economic environment indicate the carrying amount of the assets may not be recoverable. When impairment indicators are identified, we test for impairment using undiscounted cash flows. If such tests indicate impairment, then we measure and record the impairment as the difference between the carrying value of the asset and the fair value of the asset. We did not recognize any impairment charges on intangible assets that have finite useful lives or other long-lived assets in fiscal 2018, 2017 and 2016 . Revenue Recognition Software Licenses Software license fee revenue is recognized when persuasive evidence of an arrangement exists, software is made available to our customers, the fee is fixed or determinable and collection is probable. The determination of whether fees are fixed or determinable and collection is probable involves the use of judgment. If at the outset of an arrangement we determine that the arrangement fee is not fixed or determinable, revenue is deferred until the arrangement fee becomes fixed or determinable, assuming all other revenue recognition criteria have been met. If at the outset of an arrangement we determine that collectability is not probable, revenue is deferred until the earlier of when collectability becomes probable or the receipt of payment. If there is uncertainty as to the customer’s acceptance of our deliverables, revenue is not recognized until the earlier of receipt of customer acceptance, expiration of the acceptance period, or when we can demonstrate we meet the acceptance criteria. We evaluate contract terms and customer information to ensure that these criteria are met prior to our recognition of license fee revenue. We use the residual method to recognize revenue when a software arrangement includes one or more elements to be delivered at a future date provided the following criteria are met: (i) vendor-specific objective evidence (“VSOE”) of the fair value does not exist for one or more of the delivered items but exists for all undelivered elements, (ii) all other applicable revenue recognition criteria are met and (iii) the fair value of all of the undelivered elements is less than the arrangement fee. VSOE of fair value is based on the normal pricing practices for those products and services when sold separately by us and customer renewal rates for post-contract customer support services. Under the residual method, the fair value of the undelivered elements is deferred and the remaining portion of the arrangement fee is recognized as revenue. If evidence of the fair value of one or more undelivered elements does not exist, the revenue is deferred and recognized when delivery of those elements occurs or when fair value can be established. Changes to the elements in a software arrangement, the ability to identify VSOE for those elements, the fair value of the respective elements, and change to a product’s estimated life cycle could materially impact the amount of earned and unearned revenue. Revenues from post-contract customer support services, such as software maintenance, are recognized on a straight-line basis over the term of the support period. The majority of our software maintenance agreements provide technical support as well as unspecified software product upgrades and releases when and if made available by us during the term of the support period. Transactional-Based Revenues Transactional-based revenue is recognized when persuasive evidence of an arrangement exists, fees are fixed or determinable, and collection is probable. Revenues from our credit scoring, data processing, data management and SaaS subscription services are recognized as these services are performed. Revenues from transactional or unit-based license fees under software license arrangements, credit scoring, data processing, data management and SaaS subscription services agreements are recognized based on minimum contractual amounts or on system usage that exceeds minimum contractual amounts. Certain of our transactional-based revenues are based on transaction or active account volumes as reported by our clients. In instances where volumes are reported to us in arrears, we estimate volumes based on preliminary customer transaction information or average actual reported volumes for an immediate trailing period. Differences between our estimates and actual final volumes reported are recorded in the period in which actual volumes are reported. We have not experienced material variances between our estimates and actual reported volumes in the past and anticipate that we will be able to continue to make reasonable estimates in the future. If for some reason we were unable to reasonably estimate transaction volumes in the future, revenue may be deferred until actual customer data is received, and this could have a material impact on our consolidated results of operations. Consulting Services We provide consulting, training, model development and software integration services under both hourly-based time and materials and fixed-priced contracts. Revenues from these services are generally recognized as the services are performed. For fixed-price service contracts, we use a proportionate performance model with hours as the input method of attribution to determine progress towards completion, with consideration also given to output measures, such as contract milestones, when applicable. In such instances, management is required to estimate the total estimated hours of the project. Adjustments to estimates are made in the period in which the facts requiring such revisions become known and, accordingly, recognized revenues and profits are subject to revisions as the contract progresses to completion. Estimated losses, if any, are recorded in the period in which current estimates of total contract revenue and contract costs indicate a loss. If substantive uncertainty related to customer acceptance of services exists, we defer the associated revenue until the contract is completed. We have not experienced material variances between our estimates and actual hours in the past and anticipate that we will be able to continue to make reasonable estimates in the future. If for some reason we are unable to accurately estimate the input measures, revenue would be deferred until the contract is complete, and this could have a material impact on our consolidated results of operations. Services that are sold in connection with software license arrangements generally qualify for separate accounting from the license element because they do not involve significant production, modification or customization of our products and are not otherwise considered to be essential to the functionality of our software. In arrangements where the professional services do not qualify for separate accounting from the license element, the combined software license and professional services revenue are recognized based on contract accounting using either the percentage-of-completion or completed-contract method. Multiple-Deliverable Arrangements including Non-Software When we enter into a multiple-deliverable arrangement that includes non-software, each deliverable is accounted for as a separate unit of accounting if the following criteria are met: (i) the delivered item or items have value to the customer on a standalone basis and (ii) for an arrangement that includes a general right of return relative to the delivered item(s), delivery or performance of the undelivered item(s) is considered probable and substantially in our control. We consider a deliverable to have standalone value if we sell this item separately or if the item is sold by another vendor or could be resold by the customer ; for example, we conclude professional services offered along with our SaaS subscription services typically have standalone value using this criteria. Further, our revenue arrangements generally do not include a general right of return relative to delivered products. Revenue for multiple element arrangements is allocated to the software and non-software deliverables based on a relative selling price. We use VSOE in our allocation of arrangement consideration when it is available. We define VSOE as a median price of recent standalone transactions that are priced within a narrow range, as defined by us. If a product or service is seldom sold separately, it is unlikely that we can determine VSOE. In circumstances when VSOE does not exist, we then assess whether we can obtain third-party evidence (“TPE”) of the selling price. It may be difficult for us to obtain sufficient information on competitor pricing to substantiate TPE and therefore we may not always be able to use TPE. When we are unable to establish selling price using VSOE or TPE, we use estimated selling price (“ESP”) in our allocation of arrangement consideration. The objective of ESP is to determine the price at which we would transact if the product or service were sold by us on a standalone basis. Our determination of ESP involves weighting several factors based on the specific facts and circumstances of each arrangement. The factors include, but are not limited to, geographies, market conditions, gross margin objectives, pricing practices and controls, customer segment pricing strategies and the product lifecycle. If a deliverable does not have standalone value because the aforementioned criteria are not met, we combine it with the other applicable undelivered item(s) within the arrangement and account for the multiple deliverables as one combined unit of accounting. For example, for hosting arrangements requiring a highly specialized and unique set of initial implementation and setup services prior to the commencement of hosting services, we typically conclude that these implementation or setup services do not have value to the customer on a stand-alone basis; therefore, we combine them with the hosting services as a combined unit of accounting. Revenue is recognized upon commencement of our hosting services over the expected life of the customer relationship. Gross vs. Net Revenue Reporting We apply accounting guidance to determine whether we report revenue for certain transactions based upon the gross amount billed to the customer, or the net amount retained by us. In accordance with the guidance we record revenue on a gross basis for sales in which we have acted as the principal and on a net basis for those sales in which we have in substance acted as an agent or broker in the transaction. Business Combinations Accounting for our acquisitions requires us to recognize, separately from goodwill, the assets acquired and the liabilities assumed at their acquisition-date fair values. Goodwill as of the acquisition date is measured as the excess of consideration transferred and the net of the acquisition-date fair values of the assets acquired and the liabilities assumed. While we use our best estimates and assumptions to accurately value assets acquired and liabilities assumed at the acquisition date, our estimates are inherently uncertain and subject to refinement. As a result, during the measurement period, which may be up to one year from the acquisition date, we record adjustments to the assets acquired and liabilities assumed with the corresponding offset to goodwill. Upon the conclusion of the measurement period or final determination of the values of assets acquired or liabilities assumed, whichever comes first, any subsequent adjustments are recorded to our consolidated statements of income and comprehensive income. Accounting for business combinations requires our management to make significant estimates and assumptions, especially at the acquisition date including our estimates for intangible assets, contractual obligations assumed, pre-acquisition contingencies and contingent consideration, where applicable. If we cannot reasonably determine the fair value of a pre-acquisition contingency (non-income tax related) by the end of the measurement period, we will recognize an asset or a liability for such pre-acquisition contingency if: (i) it is probable that an asset existed or a liability had been incurred at the acquisition date and (ii) the amount of the asset or liability can be reasonably estimated. Although we believe the assumptions and estimates we have made in the past have been reasonable and appropriate, they are based in part on historical experience and information obtained from the management of the acquired companies and are inherently uncertain. Subsequent to the measurement period, changes in our estimates of such contingencies will affect earnings and could have a material effect on our consolidated results of operations and financial position. Examples of critical estimates in valuing certain of the intangible assets we have acquired include but are not limited to: (i) future expected cash flows from software license sales, support agreements, consulting contracts, other customer contracts and acquired developed technologies and patents; (ii) expected costs to develop the in-process research and development into commercially viable products and estimated cash flows from the projects when completed; and (iii) the acquired company’s brand and competitive position, as well as assumptions about the period of time the acquired brand will continue to be used in the combined company’s product portfolio. Unanticipated events and circumstances may occur that may affect the accuracy or validity of such assumptions, estimates or actual results. In addition, uncertain tax positions and tax related valuation allowances assumed in connection with a business combination are initially estimated as of the acquisition date. We reevaluate these items quarterly based upon facts and circumstances that existed as of the acquisition date with any adjustments to our preliminary estimates being recorded to goodwill provided that we are within the measurement period. Subsequent to the measurement period or our final determination of the tax allowance’s or contingency’s estimated value, whichever comes first, changes to these uncertain tax positions and tax related valuation allowances will affect our provision for income taxes in our consolidated statements of income and comprehensive income and could have a material impact on our consolidated results of operations and financial position. Income Taxes We estimate our income taxes based on the various jurisdictions where we conduct business, which involves significant judgment in determining our income tax provision. We estimate our current tax liability using currently enacted tax rates and laws and assess temporary differences that result from differing treatments of certain items for tax and accounting purposes. These differences result in deferred tax assets and liabilities recorded on our balance sheet using the currently enacted tax rates and laws that will apply to taxable income for the years in which those tax assets are expected to be realized or settled. We then assess the likelihood our deferred tax assets will be realized and to the extent we believe realization is not more likely than not, we establish a valuation allowance. When we establish a valuation allowance or increase this allowance in an accounting period, we record a corresponding income tax expense in our consolidated statements of income and comprehensive income. In assessing the need for the valuation allowance, we consider future taxable income in the jurisdictions we operate; our ability to carry back tax attributes to prior years; an analysis of our deferred tax assets and the periods over which they will be realizable; and ongoing prudent and feasible tax planning strategies. An increase in the valuation allowance would have an adverse impact, which could be material, on our income tax provision and net income in the period in which we record the increase. The Tax Cuts and Jobs Act of 2017 (the “Tax Act”), as signed by the U.S. President on December 22, 2017, significantly revises U.S. tax law. The legislation reduces the U.S. federal corporate tax rate from 35% to 21%, requires companies to pay a one-time transition tax on earnings of certain foreign subsidiaries that were indefinitely reinvested and creates new taxes on certain foreign sourced earnings. The Tax Act adds many new provisions including changes to bonus depreciation, the deduction for executive compensation and interest expense, a tax on global intangible low taxed income (“GILTI”), the base erosion anti-abuse tax, a deduction for foreign derived intangible income, and the repeal of the deduction for domestic production activities. Some of these provisions, such as tax on GILTI, the repeal of the deduction for domestic production activities, and executive compensation, may not apply to the Company with full effect until future years. The Company is assessing the impact of the provisions of the Tax Act that do not apply until later years. The items that impact the Company for fiscal 2018 include, but are not limited to, 1) reduction of the U.S. federal corporate income tax rate; (2) a one-time transition tax on certain un-repatriated earnings of foreign subsidiaries; and (3) repeal of the performance-based compensation exception to the $1 million deduction limitation. The SEC staff issued Staff Accounting Bulletin No. 118 (“SAB 118”) in December 2017, which provides guidance on accounting for the tax effects of the Tax Act. SAB 118 provides a measurement period that should not extend beyond one year from the Tax Act enactment date for companies to complete the accounting under FASB Accounting Standards Codification (“ASC”) 740, “Accounting for Income Taxes” (“ASC 740”). In accordance with SAB 118, a company must reflect the income tax effects of those aspects of the Tax Act for which the accounting under ASC 740 is complete. To the extent that a company’s accounting for certain income tax effects of the Tax Act is incomplete but it is able to determine a reasonable estimate, it must record a provisional estimate in the financial statements. If a company cannot determine a provisional estimate to be included in the financial statements, it should continue to apply ASC 740 on the basis of the provisions of the tax laws that were in effect immediately before the enactment of the Tax Act. The Tax Act was effective in the first quarter of fiscal 2018. As of September 30, 2018, we have not completed our accounting for the estimated tax effects for the Transition Tax nor the excessive employee remuneration. During fiscal 2018, we recorded a provisional net charge of $9.6 million related to the Tax Act based on reasonable estimates for those tax effects and $14.0 million for the re-measurement of the deferred tax assets and liabilities, in which accounting is now complete. Due to the timing of the enactment and the complexity in applying the provisions of the Tax Act, the provisional net charge is subject to revisions as we continue to complete our analysis, collect and prepare necessary data, and interpret any additional guidance issued by the U.S. Treasury Department, Internal Revenue Service (“IRS”), FASB, and other standard-setting and regulatory bodies. Adjustments may materially impact our provision for income taxes and effective tax rate in the period in which the adjustments are made. Our accounting for the estimated tax effects of the Tax Act will be completed during the measurement period, which is not expected to extend beyond one year from the enactment date. We recognize and measure benefits for uncertain tax positions using a two-step approach. The first step is to evaluate the tax position taken or expected to be taken in a tax return by determining if the technical merits of the tax position indicate it is more likely than not that the tax position will be sustained upon audit, including resolution of any related appeals or litigation processes. For tax positions more likely than not of being sustained upon audit, the second step is to measure the tax benefit as the largest amount more than 50% likely of being realized upon settlement. Significant judgment is required to evaluate uncertain tax positions and they are evaluated on a quarterly basis. Our evaluations are based upon a number of factors, including changes in facts or circumstances, changes in tax law, correspondence with tax authorities during the course of audits and effective settlement of audit issues. Changes in the recognition or measurement of uncertain tax positions could result in material increases or decreases in our income tax expense in the period in which we make the change, which could have a material impact on our effective tax rate and operating results. A description of our accounting policies associated with tax-related contingencies and valuation allowances assumed as part of a business combination is provided under “Business Combinations” above. Earnings per Share Basic earnings per share are computed on the basis of the weighted-average number of common shares outstanding during the period under measurement. Diluted earnings per share are based on the weighted-average number of common shares outstanding and potential common shares. Potential common shares result from the assumed exercise of outstanding stock options or other potentially dilutive equity instruments, when they are dilutive under the treasury stock method. Comprehensive Income Comprehensive income is the change in our equity (net assets) during each period from transactions and other events and circumstances from non-owner sources. It inclu

Business Combinations

Business Combinations	12 Months Ended
	Sep. 30, 2018
Business Combinations [Abstract]
Business Combinations	Business Combinations There were no acquisitions incurred during fiscal 2018 and 2017. In fiscal 2016, we acquired 100% of the equity of QuadMetrics, Inc. for $5.7 million in cash. We recorded $2.0 million of intangible assets, which are being amortized using the straight-line method over a weighted average useful life of approximately 4.0 years . We allocated $3.9 million of goodwill to our Applications segment that was not deductible for tax purposes.

Cash, Cash Equivalents and Mark

Cash, Cash Equivalents and Marketable Securities Available for Sale	12 Months Ended
	Sep. 30, 2018
Cash and Cash Equivalents [Abstract]
Cash, Cash Equivalents and Marketable Securities Available for Sale	Cash, Cash Equivalents and Marketable Securities The following is a summary of cash, cash equivalents and marketable securities at September 30, 2018 and 2017 : September 30, 2018 September 30, 2017 Amortized Cost Fair Value Amortized Cost Fair Value (In thousands) Cash and Cash Equivalents: Cash $ 71,610 $ 71,610 $ 90,323 $ 90,323 Money market funds 13,813 13,813 6,471 6,471 Bank time deposits 4,600 4,600 8,824 8,824 Total $ 90,023 $ 90,023 $ 105,618 $ 105,618 Long-term Marketable Securities: Marketable securities $ 14,313 $ 18,059 $ 10,788 $ 13,791 The assets included in marketable securities represent long-term marketable equity securities held under a supplemental retirement and savings plan for senior management employees, which are distributed upon termination or retirement of the employees. These investments are treated as trading securities and recorded at fair value.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Fair value is defined as the price that would be received from the sale of an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The accounting guidance establishes a three-level hierarchy for disclosure that is based on the extent and level of judgment used to estimate the fair value of assets and liabilities. • Level 1 — uses unadjusted quoted prices that are available in active markets for identical assets or liabilities. Our Level 1 assets are comprised of money market funds and certain equity securities. • Level 2 — uses inputs other than quoted prices included in Level 1 that are either directly or indirectly observable through correlation with market data. These include quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; and inputs to valuation models or other pricing methodologies that do not require significant judgment because the inputs used in the model, such as interest rates and volatility, can be corroborated by readily observable market data. We do not have any assets that are valued using inputs identified under a Level 2 hierarchy as of September 30, 2018 and 2017 . • Level 3 — uses one or more significant inputs that are unobservable and supported by little or no market activity, and that reflect the use of significant management judgment. Level 3 assets and liabilities include those whose fair value measurements are determined using pricing models, discounted cash flow methodologies or similar valuation techniques, and significant management judgment or estimation. We do not have any assets or liabilities that are valued using inputs identified under a Level 3 hierarchy as of September 30, 2018 and 2017 . The following table represents financial assets that we measured at fair value on a recurring basis at September 30, 2018 and 2017 : September 30, 2018 Active Markets for Identical Instruments (Level 1) Fair Value as of September 30, 2018 (In thousands) Assets: Cash equivalents (1) $ 18,413 $ 18,413 Marketable securities (2) 18,059 18,059 Total $ 36,472 $ 36,472 September 30, 2017 Active Markets for Identical Instruments (Level 1) Fair Value as of September 30, 2017 (In thousands) Assets: Cash equivalents (1) $ 15,295 $ 15,295 Marketable securities (2) 13,791 13,791 Total $ 29,086 $ 29,086 (1) Included in cash and cash equivalents on our balance sheet at September 30, 2018 and 2017 . Not included in this table are cash deposits of $71.6 million and $90.3 million at September 30, 2018 and 2017 , respectively. (2) Represents securities held under a supplemental retirement and savings plan for certain officers and senior management employees, which are distributed upon termination or retirement of the employees. Included in long-term marketable securities on our consolidated balance sheets at September 30, 2018 and 2017 . Where applicable, we use quoted prices in active markets for identical assets or liabilities to determine fair value. This pricing applies to our Level 1 investments. To the extent quoted prices in active markets for assets or liabilities are not available, the valuation techniques used to measure the fair values of our financial assets incorporate market inputs, which include reported trades, broker/dealer quotes, benchmark yields, issuer spreads, benchmark securities and other inputs derived from or corroborated by observable market data. This methodology would apply to our Level 2 investments. We have not changed our valuation techniques in measuring the fair value of any financial assets and liabilities during the period. For the fair value of our derivative instruments and senior notes, see Note 5 and Note 10, respectively.

Derivative Financial Instrument

Derivative Financial Instruments	12 Months Ended
	Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments We use derivative instruments to manage risks caused by fluctuations in foreign exchange rates. The primary objective of our derivative instruments is to protect the value of foreign-currency-denominated receivable and cash balances from the effects of volatility in foreign exchange rates that might occur prior to conversion to their functional currencies. We principally utilize foreign currency forward contracts, which enable us to buy and sell foreign currencies in the future at fixed exchange rates and economically offset changes in foreign exchange rates. We routinely enter into contracts to offset exposures denominated in the British pound, Euro and Singapore dollar. Foreign-currency-denominated receivable and cash balances are remeasured at foreign exchange rates in effect on the balance sheet date with the effects of changes in foreign exchange rates reported in other income (expense), net. The forward contracts are not designated as hedges and are marked to market through other income (expense), net. Fair value changes in the forward contracts help mitigate the changes in the value of the remeasured receivable and cash balances attributable to changes in foreign exchange rates. The forward contracts are short-term in nature and typically have average maturities at inception of less than three months . The following tables summarize our outstanding foreign currency forward contracts, by currency at September 30, 2018 and 2017 : September 30, 2018 Contract Amount Fair Value Foreign Currency US$ US$ (In thousands) Sell foreign currency: Euro (EUR) EUR 9,000 $ 10,372 — Buy foreign currency: British pound (GBP) GBP 8,598 $ 11,200 — Singapore dollar (SGD) SGD 9,580 $ 7,000 — September 30, 2017 Contract Amount Fair Value Foreign Currency US$ US$ (In thousands) Sell foreign currency: Euro (EUR) EUR 5,050 $ 5,968 — Buy foreign currency: British pound (GBP) GBP 9,341 $ 12,500 — The foreign currency forward contracts were entered into on September 30 of each fiscal year; therefore, their fair value was $0 at September 30, 2018 and 2017 . Gains (losses) on derivative financial instruments are recorded in our consolidated statements of income and comprehensive income as a component of other income (expense), net. These amounts are shown below for the years ended September 30, 2018, 2017 and 2016 : Year Ended September 30, 2018 2017 2016 (In thousands) Gain (loss) on foreign currency forward contracts $ (476 ) $ 210 $ (2,911 )

Receivables

Receivables	12 Months Ended
	Sep. 30, 2018
Receivables [Abstract]
Receivables	Accounts Receivable, Net Accounts receivable, net at September 30, 2018 and 2017 consisted of the following: September 30, 2018 2017 (In thousands) Billed $ 157,333 $ 126,887 Unbilled (1) 54,971 44,640 212,304 171,527 Less: allowance for doubtful accounts (3,439 ) (2,941 ) Accounts receivable, net $ 208,865 $ 168,586 (1) Represents revenue recorded in excess of amounts billable pursuant to contract provisions and generally become billable at contractually specified dates or upon the attainment of milestones. Unbilled amounts are expected to be realized within one year. Activity in the allowance for doubtful accounts was as follows: Year Ended September 30, 2018 2017 (In thousands) Balance, beginning of year $ 2,941 $ 2,192 Add: expense 623 1,640 Less: write-offs (net of recoveries) (125 ) (891 ) Balance, end of year $ 3,439 $ 2,941

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets Intangible assets that are subject to amortization consisted of the following at September 30, 2018 and 2017 : September 30, 2018 September 30, 2017 (In thousands, except average life) Gross Carrying Amount Accumulated Amortization Net Average Life Gross Carrying Amount Accumulated Amortization Net Average Life Completed technology $ 82,295 $ (77,400 ) $ 4,895 5 $ 84,955 $ (77,682 ) $ 7,273 5 Customer contracts and relationships 28,692 (19,051 ) 9,641 8 28,947 (15,091 ) 13,856 8 Trade names — — — 0 603 (547 ) 56 3 $ 110,987 $ (96,451 ) $ 14,536 6 $ 114,505 $ (93,320 ) $ 21,185 6 Amortization expense associated with our intangible assets, which has been reflected as a separate operating expense caption within the accompanying consolidated statements of income and comprehensive income, consisted of the following during fiscal 2018, 2017 and 2016 : Year Ended September 30, 2018 2017 2016 (In thousands) Cost of revenues $ 2,380 $ 6,511 $ 7,300 Selling, general and administrative expenses 4,214 6,198 6,682 Total $ 6,594 $ 12,709 $ 13,982 In the table above, cost of revenues reflects our amortization of completed technology, and selling, general and administrative expenses reflect our amortization of other intangible assets. Estimated future intangible asset amortization expense associated with intangible assets existing at September 30, 2018 , was as follows (in thousands): Year Ending September 30, 2019 $ 6,001 2020 3,647 2021 2,408 2022 2,263 2023 217 Thereafter — Total $ 14,536 The following table summarizes changes to goodwill during fiscal 2018 and 2017 , both in total and as allocated to our operating segments. We have not recognized any goodwill impairment losses to date. Applications Scores Decision Management Software Total (In thousands) Balance at September 30, 2016 $ 582,720 $ 146,648 $ 69,047 $ 798,415 Foreign currency translation adjustment 5,568 — 431 5,999 Balance at September 30, 2017 588,288 146,648 69,478 804,414 Foreign currency translation adjustment (3,127 ) — (397 ) (3,524 ) Balance at September 30, 2018 $ 585,161 $ 146,648 $ 69,081 $ 800,890

Composition of Certain Financia

Composition of Certain Financial Statement Captions	12 Months Ended
	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Composition of Certain Financial Statement Captions	Composition of Certain Financial Statement Captions The following table presents the composition of property and equipment at September 30, 2018 and 2017 : September 30, 2018 2017 (In thousands) Property and equipment: Data processing equipment and software $ 104,789 $ 88,830 Office furniture and equipment 22,207 20,763 Leasehold improvements 29,158 25,767 Less: accumulated depreciation and amortization (107,317 ) (94,657 ) Total $ 48,837 $ 40,703

Revolving Line of Credit

Revolving Line of Credit	12 Months Ended
	Sep. 30, 2018
Debt Disclosure [Abstract]
Revolving Line of Credit	Revolving Line of Credit On May 8, 2018, we amended our credit agreement with a syndicate of banks, extending the maturity date of the unsecured revolving line of credit from December 30, 2019 to May 8, 2023 , while reducing our borrowing capacity to $400 million with an option to increase it by another $100 million . Proceeds from the credit facility can be used for working capital and general corporate purposes and may also be used for the refinancing of existing debt, acquisitions, and the repurchase of our common stock. Interest on amounts borrowed under the credit facility is based on (i) a base rate, which is the greater of (a) the prime rate and (b) the Federal Funds rate plus 0.500% and (c) the one-month LIBOR rate plus 1.000% , plus, in each case, an applicable margin, or (ii) an adjusted LIBOR rate plus an applicable margin. The applicable margin for base rate borrowings ranges from 0% to 0.875% and for LIBOR borrowings ranges from 1.000% to 1.875% and is determined based on our consolidated leverage ratio. In addition, we must pay credit facility fees. The credit facility contains certain restrictive covenants including maintaining a maximum consolidated leverage ratio of 3.25 , subject to a step up to 3.75 following certain permitted acquisitions; and a minimum fixed charge ratio of 2.50 through the maturity of our 2010 Senior Notes in July 2020, upon which maintaining a minimum interest coverage ratio of 3.00 . The credit agreement also contains other covenants typical of unsecured facilities. The credit agreement also contains other covenants typical of unsecured facilities. As of September 30, 2018 , we had $257.0 million in borrowings outstanding at a weighted average interest rate of 3.555% , of which $50.0 million was classified as a long-term liability and recorded in long-term debt within the accompanying consolidated balance sheets. We were in compliance with all financial covenants under this credit facility as of September 30, 2018 .

Senior Notes

Senior Notes	12 Months Ended
	Sep. 30, 2018
Debt Disclosure [Abstract]
Senior Notes	Senior Notes On May 7, 2008, we issued $275 million of senior notes in a private placement to a group of institutional investors (the “2008 Senior Notes”). The 2008 Senior Notes were issued in four series as follows: Series Amount Interest Rate Maturity Date (In millions) A $ 41.0 6.37 % May 7, 2013 B $ 40.0 6.37 % May 7, 2015 C $ 63.0 6.71 % May 7, 2015 D $ 131.0 7.18 % May 7, 2018 On May 7, 2018, the aggregate principal amount of the fourth series of 2008 Senior Notes was repaid at maturity. At September 30, 2018, the 2008 Senior Notes are no longer outstanding. On July 14, 2010, we issued $245 million of senior notes in a private placement to a group of institutional investors (the “2010 Senior Notes”). The 2010 Senior Notes were issued in four series as follows: Series Amount Interest Rate Maturity Date (In millions) E $ 60.0 4.72 % July 14, 2016 F $ 72.0 5.04 % July 14, 2017 G $ 28.0 5.42 % July 14, 2019 H $ 85.0 5.59 % July 14, 2020 The 2010 Senior Notes require us to pay the entire unpaid principal balances of each note series on its maturity date. The 2010 Senior Notes also require interest payments semi-annually and contain certain restrictive covenants, including the maintenance of a maximum consolidated net debt to consolidated EBITDA ratio of 3.00 and a minimum fixed charge coverage ratio of 2.50 . As of September 30, 2018, we were in compliance with all financial covenants. On May 8, 2018, we issued $400 million of senior notes in a private offering to qualified institutional investors (the “2018 Senior Notes”, and with the 2008 Senior Notes and the 2010 Senior Notes, the “Senior Notes”). We have used the net proceeds to repay all the outstanding aggregate principal amount of the 2008 Senior Notes at maturity, as well as a portion of the outstanding balance on our revolving credit facility. The 2018 Senior Notes require interest payments semi-annually at a rate of 5.25% per annum and will mature on May 15, 2026 . The purchase agreements for the 2008 and 2010 Senior Notes and the indenture for the 2018 Senior Notes contain certain covenants typical of unsecured obligations. The following table presents the carrying amounts and fair values for the Senior Notes at September 30, 2018 and 2017 : September 30, 2018 September 30, 2017 Carrying Fair Value Carrying Fair Value (In thousands) The 2008 Senior Notes $ — $ — $ 131,000 $ 134,250 The 2010 Senior Notes 113,000 114,413 113,000 119,106 The 2018 Senior Notes 400,000 404,000 — — Total $ 513,000 $ 518,413 $ 244,000 $ 253,356 (1) Amounts exclusive of net debt issuance cost of $6.1 million and $0.2 million at September 30, 2018 and 2017 , respectively. We measure the fair value of the Senior Notes based on Level 2 inputs, which include quoted market prices and interest rate spreads of similar securities. Future principal payments for the Senior Notes are as follows (in thousands): Year Ending September 30, 2019 $ 28,000 2020 85,000 2021 — 2022 — 2023 — Thereafter 400,000 Total $ 513,000

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Sep. 30, 2018
Retirement Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans Defined Contribution Plans We sponsor the Fair Isaac Corporation 401(k) plan for eligible employees in the U.S. Under this plan, eligible employees may contribute up to 25% of compensation, not to exceed statutory limits. We also provide a company matching contribution. Investment in FICO common stock is not an option under this plan. Our contributions into all 401(k) plans, including former-acquired-company-sponsored plans that have since merged into the Fair Isaac Corporation 401(k) plan or have been frozen, totaled $8.8 million , $8.4 million and $7.3 million during fiscal 2018, 2017 and 2016 , respectively. Employee Incentive Plans We maintain various employee incentive plans for the benefit of eligible employees, including officers. The awards generally are based on the achievement of certain financial and performance objectives subject to the discretion of management. Total expenses under our employee incentive plans were $48.4 million , $41.6 million and $40.0 million during fiscal 2018, 2017 and 2016 , respectively.

Restructuring Expenses

Restructuring Expenses	12 Months Ended
	Sep. 30, 2018
Restructuring and Related Activities [Abstract]
Restructuring Expenses	Restructuring Expenses There was no restructuring expense incurred during fiscal 2018. During fiscal 2017, we incurred net charges totaling $4.5 million consisting of $1.7 million in facilities charges associated with vacating excess leased space in San Rafael, California and $2.8 million in employee separation costs due to the elimination of 79 positions throughout the Company. Cash payments for all the facilities charges will be paid by the end of fiscal 2020. Cash payments for all the employee separation costs were paid before the end of the second quarter of fiscal 2018. There was no restructuring expense incurred during fiscal 2016. The following tables summarize our restructuring accruals associated with the above actions. The current portion and non-current portion was recorded in other accrued liabilities and other liabilities, respectively, within the accompanying consolidated balance sheets. Accrual at September 30, 2016 Expense Additions Cash Payments Accrual at September 30, 2017 (In thousands) Facilities charges $ 9,233 $ 1,729 $ (2,842 ) $ 8,120 Employee separation — 2,742 (2,557 ) 185 9,233 $ 4,471 $ (5,399 ) 8,305 Less: current portion (4,266 ) (3,077 ) Non-current $ 4,967 $ 5,228 Accrual at September 30, 2017 Expense Additions Cash Payments Accrual at September 30, 2018 (In thousands) Facilities charges $ 8,120 $ (2,892 ) $ 5,228 Employee separation 185 (185 ) — 8,305 $ — $ (3,077 ) 5,228 Less: current portion (3,077 ) (3,850 ) Non-current $ 5,228 $ 1,378

Income Taxes

Income Taxes	12 Months Ended
	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Recent Tax Legislation: On December 22, 2017, The Tax Cuts and Jobs Act (the “Tax Act”) was enacted by the U.S. government. The Tax Act makes broad and complex changes to the U.S. tax code that affect our fiscal year ended September 30, 2018, including, but not limited to: (1) reducing the U.S. federal corporate income tax rate; (2) requiring a one-time transition tax on certain un-repatriated earnings of foreign subsidiaries; and (3) repealing the performance-based compensation exception to the $1 million deduction limitation. The Tax Act reduces the federal corporate tax rate from 35% to 21% effective January 1, 2018. In accordance with Section 15 of the Internal Revenue Code, we have utilized a blended rate of 24.5% for our fiscal 2018 tax year by applying a prorated percentage of the number of days prior to and subsequent to the January 1, 2018 effective date. We recorded charges for the re-measurement of the deferred tax assets and liabilities of $14.0 million to our income tax expense for the fiscal year ended September 30, 2018. The Tax Act has expanded the scope of previously enacted rules for certain covered employees that receive remuneration in excess of $1 million. As these new Section 162(m) rules impact the future deductibility of the related performance-based compensation, we recorded a provisional charge of $6.0 million. The Deemed Repatriation Transition Tax (the “Transition Tax”) is a tax on previously untaxed accumulated earnings and profits (“E&P”) of deferred foreign income. To determine the amount of the Transition Tax, we must determine, in addition to other factors, the amount of post-1986 E&P of the relevant subsidiaries, as well as the amount of non-U.S. income taxes paid on such earnings. We are able to make a reasonable estimate and recorded a provisional Transition Tax obligation of $3.6 million. The SEC staff issued Staff Accounting Bulletin No. 118 (“SAB 118”) in December 2017, which provides guidance on accounting for the tax effects of the Tax Act. SAB 118 provides a measurement period that should not extend beyond one year from the Tax Act enactment date for companies to complete the accounting under FASB Accounting Standards Codification (“ASC”) 740, “Accounting for Income Taxes” (“ASC 740”). In accordance with SAB 118, a company must reflect the income tax effects of those aspects of the Tax Act for which the accounting under ASC 740 is complete. To the extent that a company’s accounting for certain income tax effects of the Tax Act is incomplete but it is able to determine a reasonable estimate, it must record a provisional estimate in the financial statements. If a company cannot determine a provisional estimate to be included in the financial statements, it should continue to apply ASC 740 on the basis of the provisions of the tax laws that were in effect immediately before the enactment of the Tax Act. The Tax Act was effective in the first quarter of fiscal 2018. As of September 30, 2018, we have not completed our accounting for the estimated tax effects for the Transition Tax nor the excessive employee remuneration. During fiscal 2018, we recorded a provisional net charge of $9.6 million related to the Tax Act based on reasonable estimates for those tax effects and $14.0 million for the re-measurement of the deferred tax assets and liabilities, in which accounting is now complete. Due to the timing of the enactment and the complexity in applying the provisions of the Tax Act, the provisional net charge is subject to revisions as we continue to complete our analysis, collect and prepare necessary data, and interpret any additional guidance issued by the U.S. Treasury Department, Internal Revenue Service (“IRS”), FASB, and other standard-setting and regulatory bodies. Adjustments may materially impact our provision for income taxes and effective tax rate in the period in which the adjustments are made. Our accounting for the estimated tax effects of the Tax Act will be completed during the measurement period, which is not expected to extend beyond one year from the enactment date. The Tax Act includes a provision to tax global intangible low-taxed income (“GILTI”) of foreign subsidiaries, a foreign derived intangible income (“FDII”), and a base erosion anti-abuse tax (“BEAT”) measure that taxes certain payments between a U.S. corporation and its foreign subsidiaries. The GILTI, FDII, and BEAT provisions of the Tax Act will be effective for us beginning October 1, 2018. The provision for income taxes was as follows during fiscal 2018, 2017 and 2016 : Year ended September 30, 2018 2017 2016 (In thousands) Current: Federal $ 8,071 $ 19,576 $ 50,631 State 2,236 1,055 2,900 Foreign 9,559 8,486 7,597 19,866 29,117 61,128 Deferred: Federal 28,013 (5,027 ) (23,592 ) State 132 (296 ) (225 ) Foreign (2,416 ) (726 ) (2,190 ) 25,729 (6,049 ) (26,007 ) Total provision $ 45,595 $ 23,068 $ 35,121 The foreign provision was based on foreign pre-tax earnings of $13.0 million , $27.8 million and $33.0 million in fiscal 2018, 2017 and 2016 , respectively. Current foreign tax expense related to foreign tax withholdings was $6.0 million , $4.6 million and $6.5 million in fiscal 2018, 2017 and 2016 , respectively. Foreign withholding tax and related foreign tax credits are included in current tax expense above. Deferred tax assets and liabilities at September 30, 2018 and 2017 were as follows: September 30, 2018 2017 (In thousands) Deferred tax assets: Loss and credit carryforwards $ 24,400 $ 34,383 Compensation benefits 30,388 45,823 Property and equipment — 3,476 Other assets 9,674 12,239 64,462 95,921 Less valuation allowance (19,564 ) (17,657 ) Total deferred tax assets 44,898 78,264 Deferred tax liabilities: Intangible assets (15,921 ) (25,346 ) Property and equipment (2,616 ) — Other liabilities (6,229 ) (5,714 ) Total deferred tax liabilities (24,766 ) (31,060 ) Deferred tax assets, net $ 20,132 $ 47,204 Based upon the level of historical taxable income and projections for future taxable income over the periods that the deferred tax assets will reverse, management believes it is more likely than not that we will realize the benefits of the deferred tax assets, net of the existing valuation allowance at September 30, 2018. As of September 30, 2018 , we had available U.S. federal, state and foreign net operating loss (“NOL”) carryforwards of approximately $13.7 million , $0.2 million , and $41.9 million , respectively. The U.S. NOLs were acquired in connection with our acquisitions of Braun in fiscal 2005, Adeptra in fiscal 2012 and Infoglide in fiscal 2013. The U.S. federal NOL carryforward will expire at various dates beginning in fiscal 2020 , if not utilized. The state NOL carryforward will expire at various dates beginning in fiscal 2021 , if not utilized. The $41.9 million of foreign NOL includes $25.1 million related to China. Due to a limited ability to utilize the China NOLs, a full valuation allowance has been recorded on the China NOLs, resulting in no tax benefit. Utilization of the U.S. federal and state NOL are subject to an annual limitation due to the “change in ownership” provisions of the Internal Revenue Code of 1986, as amended, and similar state provisions. In fiscal 2016 and 2017 we generated excess foreign tax credits associated with dividends received from two of our foreign subsidiaries. In fiscal 2018 the excess foreign tax credits generated in prior years were completely utilized. We also have available excess California state research credit of approximately $10.5 million . The California state research credit does not have an expiration date; however, based on enacted law and expected future cash taxes, we have recorded a valuation allowance of $10.5 million . A reconciliation of the provision for income taxes, with the amount computed by applying the U.S. federal statutory income tax rate ( 24.5% in fiscal 2018, and 35% in fiscal 2017 and 2016) to income before provision for income taxes for fiscal 2018, 2017 and 2016 is shown below: Year Ended September 30, 2018 2017 2016 (In thousands) Income tax provision at U.S. federal statutory rate $ 46,119 $ 52,963 $ 50,599 State income taxes, net of U.S. federal benefit 3,429 2,193 2,244 Foreign tax rate differential (42 ) (1,761 ) (4,661 ) Intercompany interest — (477 ) (1,223 ) Research credits (3,486 ) (2,572 ) (4,398 ) Domestic production deduction (3,041 ) (3,075 ) (3,726 ) Amended returns/audit settlements/statute expirations (2,349 ) (1,296 ) (248 ) Foreign 4,040 744 (1,702 ) Valuation allowance 1,907 2,512 1,262 Foreign tax credit 1,320 (1,342 ) (3,286 ) Excess tax benefits relating to stock-based compensation (22,253 ) (24,746 ) — Tax effect of the Tax Act 23,579 — — Other (3,628 ) (75 ) 260 Recorded income tax provision $ 45,595 $ 23,068 $ 35,121 The increase in our income tax provision in fiscal 2018 compared to fiscal 2017 is primarily due to recording the impact related to the enactment of the Tax Act in fiscal 2018. This includes re-measurement to our deferred tax assets and liabilities for the tax rate changes, the one-time Transition Tax, and a provisional charge related to the loss of deductibility of performance-based compensation for certain employees. The decrease in our income tax provision in fiscal 2017 compared to fiscal 2016 was due primarily to the adoption of ASU 2016-09 on October 1, 2016. We no longer record excess tax benefits as an increase to additional paid-in capital, but instead record such excess tax benefits on a prospective basis as a reduction of income tax expense. Prior to the enactment of the Tax Act we had not made a provision for U.S. income or additional foreign withholding taxes on the excess of the amount for financial reporting over the tax basis of investments in foreign subsidiaries as we intended to reinvest the earnings of our non-U.S. subsidiaries in those operations indefinitely, except where we were able to repatriate these earnings to the U.S. without material incremental tax provision. As of September 30, 2018, we have approximately $79.7 million of unremitted earnings of non-U.S. subsidiaries, of which $57.9 million was included in our current year provision for income taxes due to the one-time Transition Tax on the deemed repatriation of deferred foreign income under the Tax Act. The Company generates substantial cash flow in the U.S. and does not have a current need for the cash to be returned to the U.S. from the foreign entities. While the Transition Tax resulted in the reduction of the excess of the amount for financial reporting over the tax basis in our foreign subsidiaries such that a repatriation may not result in additional U.S. income tax, an actual repatriation from our non-US subsidiaries could still be subject to additional foreign withholding taxes and U.S. state taxes. Unrecognized Tax Benefit for Uncertain Tax Positions We conduct business globally and, as a result, file income tax returns in the U.S. federal jurisdiction and various state and foreign jurisdictions. In the normal course of business, we are subject to examination by taxing authorities. With a few exceptions, we are no longer subject to U.S. federal, state, local, or foreign income tax examinations for fiscal years prior to 2014. We are currently under audit by Illinois for fiscal 2014 and 2015, Minnesota for fiscal 2013, 2014, 2015 and 2016 and California for fiscal 2016 and 2017. We do not anticipate any adjustments related to those audits that will result in a material change to our consolidated financial statements. A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows: Year Ended September 30, 2018 2017 2016 (In thousands) Gross unrecognized tax benefits at beginning of year $ 6,480 $ 6,799 $ 4,634 Gross increases for tax positions in prior years 404 57 1,004 Gross decreases for tax positions in prior years — (19 ) (117 ) Gross increases based on tax positions related to the current year 1,625 1,291 1,310 Decreases for settlements and payments — (151 ) (32 ) Decreases due to statue expiration (2,396 ) (1,497 ) — Gross unrecognized tax benefits at end of year $ 6,113 $ 6,480 $ 6,799 We had $6.1 million of total unrecognized tax benefits as of September 30, 2018 , including $5.8 million of tax benefits that, if recognized, would impact the effective tax rate. Although the timing and outcome of audit settlements are uncertain, it is unlikely there will be a reduction of the uncertain tax benefits in the next twelve months. We recognize interest expense related to unrecognized tax benefits and penalties as part of the provision for income taxes in our consolidated statements of income and comprehensive income. We recognize interest earned related to income tax matters as interest income in our consolidated statements of income and comprehensive income. As of September 30, 2018 , we have accrued interest of $0.3 million related to the unrecognized tax benefits.

Stock-Based Employee Benefit Pl

Stock-Based Employee Benefit Plans	12 Months Ended
	Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Employee Benefit Plans	Stock-Based Employee Benefit Plans Description of Stock Option and Share Plans We maintain the 2012 Long-Term Incentive Plan (the “2012 Plan”) under which we are authorized to issue equity awards, including stock options, stock appreciation rights, restricted stock awards, stock unit awards and other stock-based awards. All employees, consultants and advisors of FICO or any subsidiary, as well as all non-employee directors are eligible to receive awards under the 2012 Plan. We also have awards currently outstanding under the 1992 Long-Term Incentive Plan, which was adopted in February 1992 and expired in February 2012. Stock option awards have a maximum term of seven years. In general, stock option awards and restricted stock unit awards not subject to market or performance conditions vest annually over four years. Restricted stock unit awards subject to market or performance conditions vest annually over three years based on the achievement of specified criteria. At September 30, 2018 , there were 4,202,040 shares available for issuance under the 2012 Plan. Description of Employee Stock Purchase Plan Under our 1999 Employee Stock Purchase Plan (the “1999 Purchase Plan”), we are authorized to issue up to 5,062,500 shares of common stock to eligible employees. Employees may have up to 10% of their base salary withheld through payroll deductions to purchase FICO common stock during semi-annual offering periods. The purchase price of the stock is 85% of the fair market value on the exercise date (the last day of each offering period). Offering period means approximately six -month periods commencing (a) on the first trading day on or after January 1 and terminating on the last trading day in the following June, and (b) on the first trading day on or after July 1 and terminating on the last trading day in the following December. The 1999 Purchase Plan was suspended effective January 1, 2009 and employees cannot contribute to the 1999 Purchase Plan until the suspension is repealed. At September 30, 2018 , there were 2,707,966 shares available for issuance under the 1999 Purchase Plan. We satisfy stock option exercises, vesting of restricted stock units and the 1999 Purchase Plan issuances from treasury shares. Share-Based Compensation Expense and Related Income Tax Benefits We recorded share-based compensation expense of $74.8 million , $61.2 million and $55.5 million in fiscal years 2018, 2017 and 2016 , respectively. The total tax benefit related to this share-based compensation expense was $15.7 million , $20.4 million and $18.7 million in fiscal 2018, 2017 and 2016 , respectively. As of September 30, 2018 , there was $105.1 million of total unrecognized compensation cost related to non-vested share-based compensation arrangements granted under all equity compensation plans. Total unrecognized compensation cost will be adjusted for future changes in estimated forfeitures. We expect to recognize that cost over a weighted average period of 2.33 years. In fiscal 2018 we received $11.0 million in cash from stock option exercises, with the tax benefit realized for the tax deductions from these exercises of $10.7 million . Stock-Based Activity Stock Options We estimate the fair value of stock options granted using the Black-Scholes option valuation model and we amortize the fair value on a straight-line basis over the vesting period. We used the following assumptions to estimate the fair value of our stock options during fiscal 2018, 2017 and 2016 : Year Ended September 30, 2018 2017 2016 Stock Options: Average expected term (years) 4.78 5.00 4.83 Expected volatility (range) 33.6 - 35.1 % 35.3 % 35.3 - 36.4 % Weighted average volatility 34.6 % 35.3 % 36.0 % Risk-free interest rate (range) 2.03 - 2.65 % 2.02 % 1.21 - 1.49 % Average expected dividend yield — % 0.07 % 0.09 % Expected dividend yield (range) — % 0.07 % 0.09 - 0.10 % Expected Volatility. We estimate the volatility of our common stock at the date of grant based on a combination of the implied volatility of publicly traded options on our common stock and our historical volatility rate. Expected Term. The expected term represents the period that our stock options are expected to be outstanding. We estimate the expected term based on historical experience of similar awards, giving consideration to the contractual terms of the stock-based awards, vesting schedules and expectations of future employee behavior. Dividends. In fiscal 2017 and 2016 the dividend yield assumption was based on historical dividend payments, which were discontinued in May 2017. Risk-Free Interest Rate. The risk-free interest rate assumption is based on observed interest rates appropriate for the term of our employee options. Forfeitures. We use historical data to estimate pre-vesting option forfeitures and record share-based compensation expense only for those awards that are expected to vest. The following table summarizes option activity during fiscal 2018 : Shares Weighted- average Exercise Price Weighted- average Remaining Contractual Term Aggregate Intrinsic Value (In thousands) (In years) (In thousands) Outstanding at October 1, 2017 1,230 $ 56.54 Granted 29 167.27 Exercised (257 ) 42.85 Forfeited (6 ) 88.17 Outstanding at September 30, 2018 996 $ 63.13 2.51 $ 164,716 Exercisable at September 30, 2018 847 $ 59.10 2.31 $ 143,529 Vested and expected to vest at September 30, 2018 993 $ 62.97 2.50 $ 164,500 The weighted average fair value of options granted were $56.61 , $43.80 and $31.06 during fiscal 2018, 2017 and 2016 , respectively. The aggregate intrinsic value of options outstanding at September 30, 2018 was calculated as the difference between the exercise price of the underlying options and the market price of our common stock for the 1.0 million outstanding shares, which had exercise prices lower than the $228.55 market price of our common stock at September 30, 2018 . The total intrinsic value of options exercised was $41.4 million , $27.0 million and $41.3 million during fiscal 2018, 2017 and 2016 , respectively, determined as of the date of exercise. Restricted Stock Units The fair value of restricted stock units (“RSUs”) granted is the closing market price of our common stock on the date of grant, adjusted for the expected dividend yield, if applicable. We amortize the fair value on a straight-line basis over the vesting period. The following table summarizes the RSUs activity during fiscal 2018 : Shares Weighted-average Grant-date Fair Value (In thousands) Outstanding at October 1, 2017 1,144 $ 97.95 Granted 458 161.85 Released (439 ) 88.21 Forfeited (50 ) 115.57 Outstanding at September 30, 2018 1,113 $ 127.34 The weighted average fair value of the RSUs granted were $161.85 , $122.47 and $94.77 during fiscal 2018, 2017 and 2016 , respectively. The total intrinsic value of the RSUs that vested was $70.7 million , $58.7 million and $49.8 million during fiscal 2018, 2017 and 2016 , respectively, determined as of the date of vesting. Performance Share Units Performance share units (“PSUs”) are granted to our senior officers and earned based on pre-established performance goals approved by the Leadership Development and Compensation Committee of our Board of Directors for any given performance period. The range of payout is zero to 200% of the number of granted PSUs, based on the outcome of the performance conditions. We estimate the fair value of the PSUs using the closing market price of our common stock on the date of grant, adjusted for the expected dividend yield if applicable, based on the performance condition that is probable of achievement. We amortize the fair values over the requisite service period for each vesting tranche of the award. We reassess the probability at each reporting period and recognize the cumulative effect of the change in estimate in the period of change. The following table summarizes the PSUs activity during fiscal 2018 : Shares Weighted- average Grant-date Fair Value (In thousands) Outstanding at October 1, 2017 204 $ 105.37 Granted 102 157.17 Released (96 ) 98.15 Outstanding at September 30, 2018 210 $ 133.76 The weighted average fair value of the PSUs granted were $157.17 , $121.30 and $91.74 during fiscal 2018, 2017 and 2016 , respectively. The total intrinsic value of the PSUs that vested was $15.1 million , $16.6 million and $14.0 million during fiscal 2018, 2017 and 2016 , respectively, determined as of the date of vesting. Market Share Units Market share units (“MSUs”) are granted to our senior officers and earned based on our total stockholder return relative to the Russell 3000 Index over performance periods of one , two and three years. We estimate the fair value of MSUs granted using the Monte Carlo valuation model and amortize the fair values over the requisite service period for each vesting tranche of the award. In addition, we do not reverse the compensation cost solely because the market condition is not satisfied, and the award is therefore not earned by the employee, provided the requisite service is rendered. We used the following assumptions to estimate the fair value of our MSUs during fiscal 2018, 2017 and 2016 : Year Ended September 30, 2018 2017 2016 Expected volatility in FICO’s stock price 24.6 % 27.4 % 24.1 % Expected volatility in Russell 3000 Index 12.7 % 13.6 % 12.8 % Correlation between FICO and the Russell 3000 Index 63.1 % 59.8 % 60.2 % Risk-free interest rate 1.92 % 1.40 % 1.25 % Average expected dividend yield — % 0.07 % 0.09 % The expected volatility was determined based on daily historical movements in our stock price and the Russell 3000 Index for the three years preceding the grant date. The correlation between FICO and the Russell 3000 Index was determined based on historical daily stock price movements for the three years preceding the grant date. The dividend yield was determined using the historical dividend payout and a trailing twelve month closing stock price on the grant date for fiscal 2017 and 2016, and in May 2017 we discontinued dividend payments. The risk-free rate was determined based on U.S. Treasury zero-coupon yields over the three -year performance period. The following table summarizes the MSUs activity during fiscal 2018 : Shares Weighted- average Grant-date Fair Value (In thousands) Outstanding at October 1, 2017 131 $ 123.82 Granted 102 151.78 Released (119 ) 113.70 Outstanding at September 30, 2018 114 $ 159.34 The weighted average fair value of the MSUs granted were $151.78 , $108.09 and $100.63 during fiscal 2018, 2017 and 2016 , respectively. The total intrinsic value of the MSUs that vested was $18.7 million , $20.2 million and $9.2 million during fiscal 2018, 2017 and 2016 , respectively, determined as of the date of vesting.

Earnings per Share

Earnings per Share	12 Months Ended
	Sep. 30, 2018
Earnings Per Share [Abstract]
Earnings per Share	Earnings per Share The following table presents reconciliations for the numerators and denominators of basic and diluted earnings per share (“EPS”) during fiscal 2018, 2017 and 2016 : Year Ended September 30, 2018 2017 2016 (In thousands, except per share data) Numerator for basic and diluted earnings per share — net income $ 142,415 $ 128,256 $ 109,448 Denominator — share: Basic weighted-average shares 29,711 30,862 31,129 Effect of dilutive securities 1,469 1,383 1,179 Diluted weighted-average shares 31,180 32,245 32,308 Earnings per share: Basic $ 4.79 $ 4.16 $ 3.52 Diluted $ 4.57 $ 3.98 $ 3.39 The computation of diluted EPS excludes options to purchase approximately 5,000 , 8,000 , and 9,000 shares of common stock for fiscal 2018, 2017 and 2016 , respectively, because the exercise prices of the options exceeded the average market price of our common stock in these fiscal years and their inclusion would be antidilutive.

Segment Information

Segment Information	12 Months Ended
	Sep. 30, 2018
Segment Reporting [Abstract]
Segment Information	Segment Information We are organized into the following three operating segments, each of which is a reportable segment, to align with internal management of our worldwide business operations based on product offerings. • Applications. This segment includes pre-configured decision management applications designed for a specific type of business problem or process — such as marketing, account origination, customer management, fraud, collections and insurance claims management — as well as associated professional services. These applications are available to our customers as on-premises software, and many are available as hosted, software-as-a-service applications through the FICO ® Analytic Cloud and/or Amazon Web Services, Inc. (“AWS”), our primary cloud infrastructure provider. • Scores. This segment includes our business-to-business scoring solutions, our myFICO ® solutions for consumers and associated professional services. Our scoring solutions give our clients access to analytics that can be easily integrated into their transaction streams and decision-making processes. Our scoring solutions are distributed through major credit reporting agencies, as well as services through which we provide our scores to clients directly. • Decision Management Software. This segment is composed of analytic and decision management software tools that clients can use to create their own custom decision management applications, our new FICO ® Decision Management Suite, as well as associated professional services. These tools are available to our customers as on-premises software or through the FICO ® Analytic Cloud and/or AWS. Our Chief Executive Officer evaluates segment financial performance based on segment revenues and segment operating income. Segment operating expenses consist of direct and indirect costs principally related to personnel, facilities, consulting, travel and depreciation. Indirect costs are allocated to the segments generally based on relative segment revenues, fixed rates established by management based upon estimated expense contribution levels and other assumptions that management considers reasonable. We do not allocate broad-based incentive expense, share-based compensation expense, restructuring and acquisition-related expense, amortization expense, various corporate charges and certain other income and expense measures to our segments. These income and expense items are not allocated because they are not considered in evaluating the segment’s operating performance. Our Chief Executive Officer does not evaluate the financial performance of each segment based on its respective assets or capital expenditures; rather, depreciation amounts are allocated to the segments from their internal cost centers as described above. The following tables summarize segment information for fiscal 2018, 2017 and 2016 : Year Ended September 30, 2018 Applications Scores Decision Management Software Unallocated Corporate Expenses Total (In thousands) Segment revenues: Transactional and maintenance $ 381,109 $ 337,530 $ 47,420 $ — $ 766,059 Professional services 142,908 1,751 32,145 — 176,804 License 61,554 3,367 24,691 — 89,612 Total segment revenues 585,571 342,648 104,256 — 1,032,475 Segment operating expense (420,995 ) (63,477 ) (134,903 ) (125,255 ) (744,630 ) Segment operating income (loss) $ 164,576 $ 279,171 $ (30,647 ) $ (125,255 ) $ 287,845 Unallocated share-based compensation expense (74,814 ) Unallocated amortization expense (6,594 ) Operating income 206,437 Unallocated interest expense, net (31,311 ) Unallocated other income, net 12,884 Income before income taxes $ 188,010 Depreciation expense $ 15,651 $ 555 $ 5,471 $ 956 $ 22,633 Year Ended September 30, 2017 Applications Scores Decision Management Software Unallocated Corporate Expenses Total (In thousands) Segment revenues: Transactional and maintenance $ 348,861 $ 259,780 $ 44,019 $ — $ 652,660 Professional services 141,857 2,849 34,863 — 179,569 License 62,449 3,725 33,766 — 99,940 Total segment revenues 553,167 266,354 112,648 — 932,169 Segment operating expense (393,667 ) (54,436 ) (123,466 ) (104,998 ) (676,567 ) Segment operating income (loss) $ 159,500 $ 211,918 $ (10,818 ) $ (104,998 ) 255,602 Unallocated share-based compensation expense (61,222 ) Unallocated amortization expense (12,709 ) Unallocated restructuring and acquisition-related expenses (4,471 ) Operating income 177,200 Unallocated interest expense, net (25,790 ) Unallocated other expense, net (86 ) Income before income taxes $ 151,324 Depreciation expense $ 15,857 $ 991 $ 4,783 $ 1,349 $ 22,980 Year Ended September 30, 2016 Applications Scores Decision Management Software Unallocated Corporate Expenses Total (In thousands) Segment revenues: Transactional and maintenance $ 328,472 $ 233,655 $ 43,792 $ — $ 605,919 Professional services 138,775 4,185 26,778 — 169,738 License 65,395 3,219 37,085 — 105,699 Total segment revenues 532,642 241,059 107,655 — 881,356 Segment operating expense (364,371 ) (55,975 ) (111,315 ) (110,612 ) (642,273 ) Segment operating income (loss) $ 168,271 $ 185,084 $ (3,660 ) $ (110,612 ) 239,083 Unallocated share-based compensation expense (55,509 ) Unallocated amortization expense (13,982 ) Operating income 169,592 Unallocated interest expense, net (26,633 ) Unallocated other income, net 1,610 Income before income taxes $ 144,569 Depreciation expense $ 11,852 $ 814 $ 3,657 $ 1,328 $ 17,651 Our revenues and percentage of revenues by reportable market segments were as follows for fiscal 2018, 2017 and 2016 , the majority of which were derived from the sale of products and services within the banking (including consumer credit) industry: Year Ended September 30, 2018 2017 2016 (Dollars in thousands) Applications $ 585,571 57 % $ 553,167 59 % $ 532,642 61 % Scores 342,648 33 % 266,354 29 % 241,059 27 % Decision Management Software 104,256 10 % 112,648 12 % 107,655 12 % Total $ 1,032,475 100 % $ 932,169 100 % $ 881,356 100 % Within our Applications segment our fraud solutions accounted for 17% , 19% and 20% of total revenues in each of fiscal 2018, 2017 and 2016 , respectively, our customer communication services accounted for 10% , 10% and 9% of total revenues in each of these periods, respectively; and our customer management solutions accounted for 8% , 8% and 9% of total revenues in each of these periods, respectively. Our revenues and percentage of revenues on a geographical basis are summarized below for fiscal 2018, 2017 and 2016 : Year Ended September 30, 2018 2017 2016 (Dollars in thousands) United States $ 679,425 66 % $ 598,765 64 % $ 567,443 64 % United Kingdom 77,053 7 % 71,989 8 % 86,485 10 % Other countries 275,997 27 % 261,415 28 % 227,428 26 % Total $ 1,032,475 100 % $ 932,169 100 % $ 881,356 100 % Revenue generated from a single customer or a group of customers which represented 10% or greater of total revenue are summarized below for fiscal 2018, 2017 and 2016 : Year Ended September 30, 2018 2017 2016 (Dollars in thousands) Experian $ 109,638 11 % $ 80,347 9 % $ 65,753 8 % TransUnion and Equifax 143,922 14 % 104,475 11 % 97,427 11 % Other customers 778,915 75 % 747,347 80 % 718,176 81 % Total $ 1,032,475 100 % $ 932,169 100 % $ 881,356 100 % At September 30, 2018 and 2017 , no individual customer accounted for 10% or more of total consolidated receivables. Our property and equipment, net, on a geographical basis are summarized below at September 30, 2018 and 2017 : September 30, 2018 2017 (Dollars in thousands) United States $ 39,593 81 % $ 30,773 76 % United Kingdom 4,296 9 % 4,893 12 % Other countries 4,948 10 % 5,037 12 % Total $ 48,837 100 % $ 40,703 100 %

Commitments

Commitments	12 Months Ended
	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments	Commitments Minimum future commitments under non-cancelable operating leases and other obligations were as follows at September 30, 2018 : Year Ending September 30, Future Minimum Lease Commitments (In thousands) 2019 $ 24,224 2020 15,694 2021 15,768 2022 14,151 2023 12,866 Thereafter 33,030 Total $ 115,733 Lease Commitments We occupy the majority of our facilities under non-cancelable operating leases with lease terms in excess of one year. Such facility leases generally provide for annual increases based upon the Consumer Price Index or fixed increments. Rent expense under operating leases, including month-to-month leases, totaled $19.8 million , $18.6 million and $17.6 million during fiscal 2018, 2017 and 2016 , respectively. Other Commitments In the ordinary course of business, we enter into contractual purchase obligations and other agreements that are legally binding and specify certain minimum payment terms. We are also a party to a management agreement with 22 of our executives providing for certain payments and other benefits in the event of a qualified change in control of FICO, coupled with a termination of the officer during the following year.

Contingencies

Contingencies	12 Months Ended
	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Contingencies We are in disputes with certain customers regarding amounts owed in connection with the sale of certain of our products and services. We also have had claims asserted by former employees relating to compensation and other employment matters. We are also involved in various other claims and legal actions arising in the ordinary course of business. We record litigation accruals for legal matters which are both probable and estimable. For legal proceedings for which there is a reasonable possibility of loss (meaning those losses for which the likelihood is more than remote but less than probable), we have determined we do not have material exposure on an aggregate basis.

Guarantees

Guarantees	12 Months Ended
	Sep. 30, 2018
Guarantees [Abstract]
Guarantees	Guarantees In the ordinary course of business, we are not subject to potential obligations under guarantees , except for standard indemnification and warranty provisions that are contained within many of our customer license and service agreements and certain supplier agreements, including underwriter agreements, as well as standard indemnification agreements that we have executed with certain of our officers and directors, and give rise only to the disclosure in the consolidated financial statements. In addition, we continue to monitor the conditions that are subject to the guarantees and indemnifications to identify whether it is probable that a loss has occurred, and would recognize any such losses under the guarantees and indemnifications when those losses are estimable. Indemnification and warranty provisions contained within our customer license and service agreements and certain supplier agreements are generally consistent with those prevalent in our industry. The duration of our product warranties generally does not exceed 90 days following delivery of our products. We have not incurred significant obligations under customer indemnification or warranty provisions historically and do not expect to incur significant obligations in the future. Accordingly, we do not maintain accruals for potential customer indemnification or warranty-related obligations. The indemnification agreements that we have executed with certain of our officers and directors would require us to indemnify such officers and directors in certain instances. We have not incurred obligations under these indemnification agreements historically and do not expect to incur significant obligations in the future. Accordingly, we do not maintain accruals for potential officer or director indemnification obligations. The maximum potential amount of future payments that we could be required to make under the indemnification provisions in our customer license and service agreements, and officer and director agreements is unlimited.

Supplementary Financial Data (U

Supplementary Financial Data (Unaudited)	12 Months Ended
	Sep. 30, 2018
Quarterly Financial Information Disclosure [Abstract]
Supplementary Financial Data (Unaudited)	Supplementary Financial Data (Unaudited) The following table presents selected unaudited consolidated financial results for each of the eight quarters in the two-year period ended September 30, 2018 . In the opinion of management, this unaudited information has been prepared on the same basis as the audited information and includes all adjustments (consisting of only normal recurring adjustments, except as noted below) necessary for a fair statement of the consolidated financial information for the period presented. Quarter Ended September 30, June 30, March 31, December 31, (In thousands, except per share data) Revenues $ 279,791 $ 259,505 $ 257,858 $ 235,321 Cost of revenues (1) 79,431 78,390 78,519 74,359 Gross profit 200,360 181,115 179,339 160,962 Net income $ 50,480 $ 32,361 $ 32,275 $ 27,299 Earnings per share (2): Basic $ 1.74 $ 1.09 $ 1.08 $ 0.91 Diluted $ 1.64 $ 1.04 $ 1.03 $ 0.86 Shares used in computing earnings per share: Basic 29,077 29,708 29,985 30,078 Diluted 30,702 31,161 31,300 31,561 Quarter Ended September 30, June 30, March 31, December 31, (In thousands, except per share data) Revenues $ 253,205 $ 230,986 $ 228,378 $ 219,600 Cost of revenues (1) 75,202 69,793 72,131 69,997 Gross profit 178,003 161,193 156,247 149,603 Net income $ 40,044 $ 25,227 $ 25,084 $ 37,901 Earnings per share (2): Basic $ 1.31 $ 0.82 $ 0.81 $ 1.22 Diluted $ 1.25 $ 0.78 $ 0.78 $ 1.16 Shares used in computing earnings per share: Basic 30,534 30,914 31,017 30,989 Diluted 31,963 32,224 32,260 32,536 (1) Cost of revenues excludes amortization expense of $0.5 million , $0.6 million , $0.6 million , $0.7 million , $1.4 million , $1.7 million , $1.7 million and $1.7 million for the quarters ended September 30, 2018 , June 30, 2018 , March 31, 2018 , December 31, 2017 , September 30, 2017 , June 30, 2017 , March 31, 2017 and December 31, 2016 , respectively. (2) Earnings per share is computed independently for each of the quarters presented. Therefore, the sum of the quarterly per share amounts may not equal the totals for the respective years.

Nature of Business and Summar_2

Nature of Business and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Principles of Consolidation and Basis of Presentation	Principles of Consolidation and Basis of Presentation The consolidated financial statements include the accounts of FICO and its subsidiaries. All intercompany accounts and transactions have been eliminated.
Use of Estimates	Use of Estimates We make estimates and assumptions that affect the amounts reported in the financial statements and the disclosures made in the accompanying notes. For example, we use estimates in determining the collectibility of accounts receivable; the appropriate levels of various accruals; labor hours in connection with fixed-fee service contracts; the amount of our tax provision and the realizability of deferred tax assets. We also use estimates in determining the remaining economic lives and carrying values of acquired intangible assets, property and equipment, and other long-lived assets. In addition, we use assumptions to estimate the fair value of reporting units and share-based compensation. Actual results may differ from our estimates.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents consist of cash in banks and investments with an original maturity of 90 days or less at time of purchase.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The fair value of certain of our financial instruments, including cash and cash equivalents, receivables, other current assets, accounts payable, accrued compensation and employee benefits, other accrued liabilities and amounts outstanding under our revolving line of credit, approximate their carrying amounts because of the short-term maturity of these instruments.
Investments	Investments We categorize our investments in debt and equity instruments as trading, available-for-sale or held-to-maturity at the time of purchase. Trading securities are carried at fair value with unrealized gains or losses included in income (expense). Available-for-sale securities are carried at fair value measurements using quoted prices in active markets for identical assets or liabilities with unrealized gains or losses included in accumulated other comprehensive income (loss). Held-to-maturity securities are carried at amortized cost. Dividends and interest income are accrued as earned. Realized gains and losses are determined on a specific identification basis and are included in other income (expense). We review marketable securities for impairment whenever circumstances and situations change such that there is an indication that the carrying amounts may not be recovered. We did not classify any securities as held-to-maturity during each of the three years ended September 30, 2018. Investments with remaining maturities over one year are classified as long-term investments. Our investments in equity securities of companies over which we do not have significant influence are accounted for under the cost method. The investment is originally recorded at cost and adjusted for additional contributions or distributions. Management periodically reviews cost-method investments for instances where fair value is less than the carrying amount and the decline in value is determined to be other than temporary. If the decline in value is judged to be other than temporary, the carrying amount of the security is written down to fair value and the resulting loss is charged to operations. We currently do not have investments in which we own 20% to 50% and exercise significant influence over operating and financial policies, therefore we do not account for any investment under the equity method.
Concentration of Risk	Concentration of Risk Financial instruments that potentially expose us to concentrations of risk consist primarily of cash and cash equivalents, marketable securities and accounts receivable, which are generally not collateralized. Our policy is to place our cash, cash equivalents, and marketable securities with high quality financial institutions, commercial corporations and government agencies in order to limit the amount of credit exposure. We have established guidelines relative to diversification and maturities for maintaining safety and liquidity. We generally do not require collateral from our customers, but our credit extension and collection policies include analyzing the financial condition of potential customers, establishing credit limits, monitoring payments, and aggressively pursuing delinquent accounts. We maintain allowances for potential credit losses. A significant portion of our revenues are derived from the sales of products and services to the consumer credit and banking industries.
Property and Equipment	Property and Equipment Property and equipment are recorded at cost less accumulated depreciation and amortization. Major renewals and improvements are capitalized, while repair and maintenance costs are expensed as incurred. Depreciation and amortization charges are calculated using the straight-line method over the following estimated useful lives: Estimated Useful Life Data processing equipment and software 3 to 6 years Office furniture and equipment 3 to 7 years Leasehold improvements Shorter of estimated useful life or lease term The cost and accumulated depreciation for property and equipment sold, retired or otherwise disposed of are removed from the applicable accounts and resulting gains or losses are recorded in our consolidated statements of income and comprehensive income.
Internal-use Software	Internal-Use Software Costs incurred to develop internal-use software during the application development stage are capitalized and reported at cost. Application development stage costs generally include costs associated with internal-use software configuration, coding, installation and testing. Costs of significant upgrades and enhancements that result in additional functionality are also capitalized whereas costs incurred for maintenance and minor upgrades and enhancements are expensed as incurred. Capitalized costs are amortized using the straight-line method over two to three years. Software development costs required to be capitalized for internal-use software have not been material to date.
Capitalized Software and Research and Development Costs	Capitalized Software and Research and Development Costs Software development costs relating to products to be sold in the normal course of business are expensed as incurred as research and development costs until technological feasibility is established. Technological feasibility for our products occurs approximately concurrently with the general release of our products; accordingly, we have not capitalized any development or production costs. Costs we incur to maintain and support our existing products after the general release of the product are expensed in the period they are incurred and included in research and development costs in our consolidated statements of income and comprehensive income.
Goodwill and Intangible Assets	Goodwill, Acquisition Intangibles and Other Long-Lived Assets Goodwill represents the excess of cost over the fair value of identifiable assets acquired and liabilities assumed in business combinations. We assess goodwill for impairment for each of our reporting units on an annual basis during the fourth quarter using a July 1 measurement date unless circumstances require a more frequent measurement. We have determined that our reporting units are the same as our reportable segments. When evaluating goodwill for impairment, we may first perform an assessment qualitatively whether it is more likely than not that a reporting unit's carrying amount exceeds its fair value, referred to as a “step zero” approach. If, based on the review of the qualitative factors, we determine it is not more likely than not that the fair value of a reporting unit is less than its carrying value, we would bypass the two-step impairment test. Events and circumstances we consider in performing the “step zero” qualitative assessment include macro-economic conditions, market and industry conditions, internal cost factors, share price fluctuations, and the operational stability and the overall financial performance of the reporting units. If we conclude that it is more likely than not that a reporting unit's fair value is less than its carrying amount, we would perform the first step (“step one”) of the two-step impairment test and calculate the estimated fair value of the reporting unit by using discounted cash flow valuation models and by comparing our reporting units to guideline publicly-traded companies. These methods require estimates of our future revenues, profits, capital expenditures, working capital, and other relevant factors, as well as selecting appropriate guideline publicly-traded companies for each reporting unit. We estimate these amounts by evaluating historical trends, current budgets, operating plans, industry data, and other relevant factors. Alternatively, we may bypass the qualitative assessment described above for any reporting unit in any period and proceed directly to performing step one of the goodwill impairment test. For fiscal 2018 and 2016, we performed a step zero qualitative analysis for our annual assessment of goodwill impairment. After evaluating and weighing all relevant events and circumstances, we concluded that it is not more likely than not that the fair value of any of our reporting units was less their carrying amounts, and did not perform a step one quantitative analysis. For fiscal 2017, we elected to proceed directly to the step one quantitative analysis for all of our reporting units, and determined goodwill was not impaired for any of our reporting units as there was a substantial excess of fair value over carrying value for each of our reporting units. Consequently, we did not recognize any goodwill impairment charges in fiscal 2018, 2017 or 2016. We amortize our finite-lived intangible assets which result from our acquisitions over the following estimated useful lives: Estimated Useful Life Completed technology 4 to 10 years Customer contracts and relationships 5 to 15 years Trade names 3 years
Impairment of Long-Lived Assets	Our intangible assets that have finite useful lives and other long-lived assets are assessed for potential impairment when there is evidence that events and circumstances related to our financial performance and economic environment indicate the carrying amount of the assets may not be recoverable. When impairment indicators are identified, we test for impairment using undiscounted cash flows. If such tests indicate impairment, then we measure and record the impairment as the difference between the carrying value of the asset and the fair value of the asset.
Revenue Recognition	Revenue Recognition Software Licenses Software license fee revenue is recognized when persuasive evidence of an arrangement exists, software is made available to our customers, the fee is fixed or determinable and collection is probable. The determination of whether fees are fixed or determinable and collection is probable involves the use of judgment. If at the outset of an arrangement we determine that the arrangement fee is not fixed or determinable, revenue is deferred until the arrangement fee becomes fixed or determinable, assuming all other revenue recognition criteria have been met. If at the outset of an arrangement we determine that collectability is not probable, revenue is deferred until the earlier of when collectability becomes probable or the receipt of payment. If there is uncertainty as to the customer’s acceptance of our deliverables, revenue is not recognized until the earlier of receipt of customer acceptance, expiration of the acceptance period, or when we can demonstrate we meet the acceptance criteria. We evaluate contract terms and customer information to ensure that these criteria are met prior to our recognition of license fee revenue. We use the residual method to recognize revenue when a software arrangement includes one or more elements to be delivered at a future date provided the following criteria are met: (i) vendor-specific objective evidence (“VSOE”) of the fair value does not exist for one or more of the delivered items but exists for all undelivered elements, (ii) all other applicable revenue recognition criteria are met and (iii) the fair value of all of the undelivered elements is less than the arrangement fee. VSOE of fair value is based on the normal pricing practices for those products and services when sold separately by us and customer renewal rates for post-contract customer support services. Under the residual method, the fair value of the undelivered elements is deferred and the remaining portion of the arrangement fee is recognized as revenue. If evidence of the fair value of one or more undelivered elements does not exist, the revenue is deferred and recognized when delivery of those elements occurs or when fair value can be established. Changes to the elements in a software arrangement, the ability to identify VSOE for those elements, the fair value of the respective elements, and change to a product’s estimated life cycle could materially impact the amount of earned and unearned revenue. Revenues from post-contract customer support services, such as software maintenance, are recognized on a straight-line basis over the term of the support period. The majority of our software maintenance agreements provide technical support as well as unspecified software product upgrades and releases when and if made available by us during the term of the support period. Transactional-Based Revenues Transactional-based revenue is recognized when persuasive evidence of an arrangement exists, fees are fixed or determinable, and collection is probable. Revenues from our credit scoring, data processing, data management and SaaS subscription services are recognized as these services are performed. Revenues from transactional or unit-based license fees under software license arrangements, credit scoring, data processing, data management and SaaS subscription services agreements are recognized based on minimum contractual amounts or on system usage that exceeds minimum contractual amounts. Certain of our transactional-based revenues are based on transaction or active account volumes as reported by our clients. In instances where volumes are reported to us in arrears, we estimate volumes based on preliminary customer transaction information or average actual reported volumes for an immediate trailing period. Differences between our estimates and actual final volumes reported are recorded in the period in which actual volumes are reported. We have not experienced material variances between our estimates and actual reported volumes in the past and anticipate that we will be able to continue to make reasonable estimates in the future. If for some reason we were unable to reasonably estimate transaction volumes in the future, revenue may be deferred until actual customer data is received, and this could have a material impact on our consolidated results of operations. Consulting Services We provide consulting, training, model development and software integration services under both hourly-based time and materials and fixed-priced contracts. Revenues from these services are generally recognized as the services are performed. For fixed-price service contracts, we use a proportionate performance model with hours as the input method of attribution to determine progress towards completion, with consideration also given to output measures, such as contract milestones, when applicable. In such instances, management is required to estimate the total estimated hours of the project. Adjustments to estimates are made in the period in which the facts requiring such revisions become known and, accordingly, recognized revenues and profits are subject to revisions as the contract progresses to completion. Estimated losses, if any, are recorded in the period in which current estimates of total contract revenue and contract costs indicate a loss. If substantive uncertainty related to customer acceptance of services exists, we defer the associated revenue until the contract is completed. We have not experienced material variances between our estimates and actual hours in the past and anticipate that we will be able to continue to make reasonable estimates in the future. If for some reason we are unable to accurately estimate the input measures, revenue would be deferred until the contract is complete, and this could have a material impact on our consolidated results of operations. Services that are sold in connection with software license arrangements generally qualify for separate accounting from the license element because they do not involve significant production, modification or customization of our products and are not otherwise considered to be essential to the functionality of our software. In arrangements where the professional services do not qualify for separate accounting from the license element, the combined software license and professional services revenue are recognized based on contract accounting using either the percentage-of-completion or completed-contract method. Multiple-Deliverable Arrangements including Non-Software When we enter into a multiple-deliverable arrangement that includes non-software, each deliverable is accounted for as a separate unit of accounting if the following criteria are met: (i) the delivered item or items have value to the customer on a standalone basis and (ii) for an arrangement that includes a general right of return relative to the delivered item(s), delivery or performance of the undelivered item(s) is considered probable and substantially in our control. We consider a deliverable to have standalone value if we sell this item separately or if the item is sold by another vendor or could be resold by the customer ; for example, we conclude professional services offered along with our SaaS subscription services typically have standalone value using this criteria. Further, our revenue arrangements generally do not include a general right of return relative to delivered products. Revenue for multiple element arrangements is allocated to the software and non-software deliverables based on a relative selling price. We use VSOE in our allocation of arrangement consideration when it is available. We define VSOE as a median price of recent standalone transactions that are priced within a narrow range, as defined by us. If a product or service is seldom sold separately, it is unlikely that we can determine VSOE. In circumstances when VSOE does not exist, we then assess whether we can obtain third-party evidence (“TPE”) of the selling price. It may be difficult for us to obtain sufficient information on competitor pricing to substantiate TPE and therefore we may not always be able to use TPE. When we are unable to establish selling price using VSOE or TPE, we use estimated selling price (“ESP”) in our allocation of arrangement consideration. The objective of ESP is to determine the price at which we would transact if the product or service were sold by us on a standalone basis. Our determination of ESP involves weighting several factors based on the specific facts and circumstances of each arrangement. The factors include, but are not limited to, geographies, market conditions, gross margin objectives, pricing practices and controls, customer segment pricing strategies and the product lifecycle. If a deliverable does not have standalone value because the aforementioned criteria are not met, we combine it with the other applicable undelivered item(s) within the arrangement and account for the multiple deliverables as one combined unit of accounting. For example, for hosting arrangements requiring a highly specialized and unique set of initial implementation and setup services prior to the commencement of hosting services, we typically conclude that these implementation or setup services do not have value to the customer on a stand-alone basis; therefore, we combine them with the hosting services as a combined unit of accounting. Revenue is recognized upon commencement of our hosting services over the expected life of the customer relationship. Gross vs. Net Revenue Reporting We apply accounting guidance to determine whether we report revenue for certain transactions based upon the gross amount billed to the customer, or the net amount retained by us. In accordance with the guidance we record revenue on a gross basis for sales in which we have acted as the principal and on a net basis for those sales in which we have in substance acted as an agent or broker in the transaction.
Business Combinations	Business Combinations Accounting for our acquisitions requires us to recognize, separately from goodwill, the assets acquired and the liabilities assumed at their acquisition-date fair values. Goodwill as of the acquisition date is measured as the excess of consideration transferred and the net of the acquisition-date fair values of the assets acquired and the liabilities assumed. While we use our best estimates and assumptions to accurately value assets acquired and liabilities assumed at the acquisition date, our estimates are inherently uncertain and subject to refinement. As a result, during the measurement period, which may be up to one year from the acquisition date, we record adjustments to the assets acquired and liabilities assumed with the corresponding offset to goodwill. Upon the conclusion of the measurement period or final determination of the values of assets acquired or liabilities assumed, whichever comes first, any subsequent adjustments are recorded to our consolidated statements of income and comprehensive income. Accounting for business combinations requires our management to make significant estimates and assumptions, especially at the acquisition date including our estimates for intangible assets, contractual obligations assumed, pre-acquisition contingencies and contingent consideration, where applicable. If we cannot reasonably determine the fair value of a pre-acquisition contingency (non-income tax related) by the end of the measurement period, we will recognize an asset or a liability for such pre-acquisition contingency if: (i) it is probable that an asset existed or a liability had been incurred at the acquisition date and (ii) the amount of the asset or liability can be reasonably estimated. Although we believe the assumptions and estimates we have made in the past have been reasonable and appropriate, they are based in part on historical experience and information obtained from the management of the acquired companies and are inherently uncertain. Subsequent to the measurement period, changes in our estimates of such contingencies will affect earnings and could have a material effect on our consolidated results of operations and financial position. Examples of critical estimates in valuing certain of the intangible assets we have acquired include but are not limited to: (i) future expected cash flows from software license sales, support agreements, consulting contracts, other customer contracts and acquired developed technologies and patents; (ii) expected costs to develop the in-process research and development into commercially viable products and estimated cash flows from the projects when completed; and (iii) the acquired company’s brand and competitive position, as well as assumptions about the period of time the acquired brand will continue to be used in the combined company’s product portfolio. Unanticipated events and circumstances may occur that may affect the accuracy or validity of such assumptions, estimates or actual results. In addition, uncertain tax positions and tax related valuation allowances assumed in connection with a business combination are initially estimated as of the acquisition date. We reevaluate these items quarterly based upon facts and circumstances that existed as of the acquisition date with any adjustments to our preliminary estimates being recorded to goodwill provided that we are within the measurement period. Subsequent to the measurement period or our final determination of the tax allowance’s or contingency’s estimated value, whichever comes first, changes to these uncertain tax positions and tax related valuation allowances will affect our provision for income taxes in our consolidated statements of income and comprehensive income and could have a material impact on our consolidated results of operations and financial position.
Income Taxes	Income Taxes We estimate our income taxes based on the various jurisdictions where we conduct business, which involves significant judgment in determining our income tax provision. We estimate our current tax liability using currently enacted tax rates and laws and assess temporary differences that result from differing treatments of certain items for tax and accounting purposes. These differences result in deferred tax assets and liabilities recorded on our balance sheet using the currently enacted tax rates and laws that will apply to taxable income for the years in which those tax assets are expected to be realized or settled. We then assess the likelihood our deferred tax assets will be realized and to the extent we believe realization is not more likely than not, we establish a valuation allowance. When we establish a valuation allowance or increase this allowance in an accounting period, we record a corresponding income tax expense in our consolidated statements of income and comprehensive income. In assessing the need for the valuation allowance, we consider future taxable income in the jurisdictions we operate; our ability to carry back tax attributes to prior years; an analysis of our deferred tax assets and the periods over which they will be realizable; and ongoing prudent and feasible tax planning strategies. An increase in the valuation allowance would have an adverse impact, which could be material, on our income tax provision and net income in the period in which we record the increase. The Tax Cuts and Jobs Act of 2017 (the “Tax Act”), as signed by the U.S. President on December 22, 2017, significantly revises U.S. tax law. The legislation reduces the U.S. federal corporate tax rate from 35% to 21%, requires companies to pay a one-time transition tax on earnings of certain foreign subsidiaries that were indefinitely reinvested and creates new taxes on certain foreign sourced earnings. The Tax Act adds many new provisions including changes to bonus depreciation, the deduction for executive compensation and interest expense, a tax on global intangible low taxed income (“GILTI”), the base erosion anti-abuse tax, a deduction for foreign derived intangible income, and the repeal of the deduction for domestic production activities. Some of these provisions, such as tax on GILTI, the repeal of the deduction for domestic production activities, and executive compensation, may not apply to the Company with full effect until future years. The Company is assessing the impact of the provisions of the Tax Act that do not apply until later years. The items that impact the Company for fiscal 2018 include, but are not limited to, 1) reduction of the U.S. federal corporate income tax rate; (2) a one-time transition tax on certain un-repatriated earnings of foreign subsidiaries; and (3) repeal of the performance-based compensation exception to the $1 million deduction limitation. The SEC staff issued Staff Accounting Bulletin No. 118 (“SAB 118”) in December 2017, which provides guidance on accounting for the tax effects of the Tax Act. SAB 118 provides a measurement period that should not extend beyond one year from the Tax Act enactment date for companies to complete the accounting under FASB Accounting Standards Codification (“ASC”) 740, “Accounting for Income Taxes” (“ASC 740”). In accordance with SAB 118, a company must reflect the income tax effects of those aspects of the Tax Act for which the accounting under ASC 740 is complete. To the extent that a company’s accounting for certain income tax effects of the Tax Act is incomplete but it is able to determine a reasonable estimate, it must record a provisional estimate in the financial statements. If a company cannot determine a provisional estimate to be included in the financial statements, it should continue to apply ASC 740 on the basis of the provisions of the tax laws that were in effect immediately before the enactment of the Tax Act. The Tax Act was effective in the first quarter of fiscal 2018. As of September 30, 2018, we have not completed our accounting for the estimated tax effects for the Transition Tax nor the excessive employee remuneration. During fiscal 2018, we recorded a provisional net charge of $9.6 million related to the Tax Act based on reasonable estimates for those tax effects and $14.0 million for the re-measurement of the deferred tax assets and liabilities, in which accounting is now complete. Due to the timing of the enactment and the complexity in applying the provisions of the Tax Act, the provisional net charge is subject to revisions as we continue to complete our analysis, collect and prepare necessary data, and interpret any additional guidance issued by the U.S. Treasury Department, Internal Revenue Service (“IRS”), FASB, and other standard-setting and regulatory bodies. Adjustments may materially impact our provision for income taxes and effective tax rate in the period in which the adjustments are made. Our accounting for the estimated tax effects of the Tax Act will be completed during the measurement period, which is not expected to extend beyond one year from the enactment date. We recognize and measure benefits for uncertain tax positions using a two-step approach. The first step is to evaluate the tax position taken or expected to be taken in a tax return by determining if the technical merits of the tax position indicate it is more likely than not that the tax position will be sustained upon audit, including resolution of any related appeals or litigation processes. For tax positions more likely than not of being sustained upon audit, the second step is to measure the tax benefit as the largest amount more than 50% likely of being realized upon settlement. Significant judgment is required to evaluate uncertain tax positions and they are evaluated on a quarterly basis. Our evaluations are based upon a number of factors, including changes in facts or circumstances, changes in tax law, correspondence with tax authorities during the course of audits and effective settlement of audit issues. Changes in the recognition or measurement of uncertain tax positions could result in material increases or decreases in our income tax expense in the period in which we make the change, which could have a material impact on our effective tax rate and operating results. A description of our accounting policies associated with tax-related contingencies and valuation allowances assumed as part of a business combination is provided under “Business Combinations” above.
Earnings per Share	Earnings per Share Basic earnings per share are computed on the basis of the weighted-average number of common shares outstanding during the period under measurement. Diluted earnings per share are based on the weighted-average number of common shares outstanding and potential common shares. Potential common shares result from the assumed exercise of outstanding stock options or other potentially dilutive equity instruments, when they are dilutive under the treasury stock method.
Comprehensive Income	Comprehensive Income Comprehensive income is the change in our equity (net assets) during each period from transactions and other events and circumstances from non-owner sources. It includes net income, foreign currency translation adjustments and unrealized gains and losses on our investments in marketable securities, net of tax.
Foreign Currency and Derivative Financial Instruments	Foreign Currency and Derivative Financial Instruments We have determined that the functional currency of each foreign operation is the local currency. Assets and liabilities denominated in their local foreign currencies are translated into U.S. dollars at the exchange rate on the balance sheet date. Revenues and expenses are translated at average rates of exchange prevailing during the period. Foreign currency translation adjustments are accumulated as a separate component of consolidated stockholders’ equity. We utilize derivative instruments to manage market risks associated with fluctuations in certain foreign currency exchange rates as they relate to specific balances of accounts receivable and cash denominated in foreign currencies. We principally utilize foreign currency forward contracts to protect against market risks arising in the normal course of business. Our policies prohibit the use of derivative instruments for the sole purpose of trading for profit on price fluctuations or to enter into contracts that intentionally increase our underlying exposure. All of our foreign currency forward contracts have maturity periods of less than three months. At the end of the reporting period, foreign-currency-denominated assets and liabilities are remeasured into the functional currencies of the reporting entities at current market rates. The change in value from this remeasurement is reported as a foreign exchange gain or loss for that period in other income (expense), net in the accompanying consolidated statements of income and comprehensive income.
Share-Based Compensation	Share-Based Compensation We measure stock-based compensation cost at the grant date based on the fair value of the award and recognize it as expense, net of estimated forfeitures, over the vesting or service period, as applicable, of the stock award (generally three to four years).
Advertising and Promotion Costs	Advertising and Promotion Costs Advertising and promotion costs are expensed as incurred and are included in selling, general and administrative expenses in the accompanying consolidated statements of income and comprehensive income.
New Accounting Pronouncements	New Accounting Pronouncements Recent Accounting Pronouncements Not Yet Adopted In February 2018, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) No. 2018-02, “ Income Statement — Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income ” (“ASU 2018-02”). ASU 2018-02 allows reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Act and requires certain disclosures about stranded tax effects. The guidance is effective for fiscal years and interim periods beginning after December 15, 2018, which means it will be effective for our fiscal year beginning October 1, 2019. ASU 2018-02 should be applied either in the period of adoption or retrospectively to each period (or periods) in which the effect of the change in the U.S. federal corporate income tax rate in the Tax Act is recognized. We do not believe that adoption of ASU 2018-02 will have a significant impact on our consolidated financial statements. In October 2016, the FASB issued ASU No. 2016-16, “ Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory ” (“ASU 2016-16”). ASU 2016-16 requires an entity to recognize the income tax consequences of an intra-entity transfer of an asset, other than inventory, when the transfer occurs. The guidance is effective for fiscal years and interim periods beginning after December 15, 2017, which means it will be effective for our fiscal year beginning October 1, 2018. ASU 2016-16 should be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings at the beginning of the period of adoption. Early adoption is permitted as of the beginning of an annual reporting period for which financial statements (interim or annual) have not been issued. We do not believe that adoption of ASU 2016-16 will have a significant impact on our consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, “ Leases (Topic 842) ” (“ASU 2016-02”), which requires lessees to put most leases on their balance sheets but recognize the expenses on their income statements in a manner similar to current practice. ASU 2016-02 states that a lessee would recognize a lease liability for the obligation to make lease payments and a right-to-use asset for the right to use the underlying asset for the lease term. ASU 2016-02 is effective for fiscal years and interim periods within those fiscal years beginning after December 15, 2018, which means it will be effective for our fiscal year beginning October 1, 2019. Early adoption is permitted. We are currently evaluating the impact of our pending adoption of Topic 842 on our consolidated financial statements. We expect that most of our operating leases will be recognized as right-of-use assets and corresponding lease liabilities on our consolidated balance sheets, which will increase our total assets and total liabilities upon adoption. In May 2014, the FASB issued ASU No. 2014-09, “ Revenue from Contracts with Customers (Topic 606) ” (“ASU 2014-09”). The standard’s core principle is that a reporting entity will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In addition, the standard requires disclosure of the nature, amount, timing, and uncertainty of revenue and cash flows arising from the contracts with customers. The guidance permits two methods of adoption: retrospectively to each prior reporting period presented (full retrospective method method), or the retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (modified retrospective method). We have adopted the standard using the full retrospective method. The standard is effective for us beginning October 1, 2018. In preparation for adoption of the new standard, we have implemented internal controls and key system functionality to enable the preparation of financial information and have reached conclusions on key accounting assessments related to the standard, including our assessment of the impact of accounting for costs incurred to obtain a contract. The most significant impact of the standard relates to the timing of revenue recognition for term licenses and transactional revenue on guaranteed minimum fees related to our on-premises software products. Under the new standard, we expect to recognize revenue when control of the license transfers to the customer, rather than at the date payments become due and payable when there are extended payment terms, or ratably over the term of the contract as required under the current standard. In addition, revenue attributable to a software license renewal will be recognized at the beginning of the applicable renewal period, rather than at the signing of the renewal agreement as required under the current standard. Finally, when we enter into noncancellable contracts that provide unconditional rights to payment from our customers for services we have not yet completed, or services we will provide in the near future, we expect to present the unconditional rights as receivables regardless of whether cash has been received from customers. In addition, Accounting Standards Codification Subtopic 340-40, “ Other Assets and Deferred Costs - Contracts with Customers ” (“ASC 340”), requires us to recognize an asset for the incremental costs of obtaining a contract with a customer if our sales incentive programs meet requirements for capitalization. Previously we recorded these incremental costs of obtaining a contract, primarily commission expense, when we booked a sales transaction, whereas under ASC 340, we record an asset for the incremental cost to obtain a contract and recognize the cost over the expected revenue recognition period. We estimate the adoption of the standard will result in a revenue reduction of approximately $32.3 million and an increase of approximately $2.8 million during our fiscal years 2018 and 2017, respectively. This is primarily due to change in timing of recognition of license revenue — when control of license transfers versus when fees became due and payable, and only at the beginning of the renewal period when applicable — from arrangements entered into during fiscal years 2018 and 2017, as well as arrangements entered into prior to fiscal 2017. In addition, while we continue to evaluate other impacts Topic 606 will have on our consolidated financial statements, including those related to our commission costs and receivables accounts as mentioned above, we do not expect the impact will be material to our consolidated financial statements. In future periods, the new standard will require us to disclose additional information in the notes to our consolidated financial statements, including disaggregation of our revenue, remaining performance obligations, and other quantitative and qualitative information about our contracts with customers.

Nature of Business and Summar_3

Nature of Business and Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Estimated Useful Life of Property and Equipment	Depreciation and amortization charges are calculated using the straight-line method over the following estimated useful lives: Estimated Useful Life Data processing equipment and software 3 to 6 years Office furniture and equipment 3 to 7 years Leasehold improvements Shorter of estimated useful life or lease term
Estimated Useful Life of Definite-Lived Intangible Assets	We amortize our finite-lived intangible assets which result from our acquisitions over the following estimated useful lives: Estimated Useful Life Completed technology 4 to 10 years Customer contracts and relationships 5 to 15 years Trade names 3 years

Cash, Cash Equivalents and Ma_2

Cash, Cash Equivalents and Marketable Securities Available for Sale (Tables)	12 Months Ended
	Sep. 30, 2018
Cash and Cash Equivalents [Abstract]
Summary of Cash, Cash Equivalents and Marketable Securities Available for Sale	The following is a summary of cash, cash equivalents and marketable securities at September 30, 2018 and 2017 : September 30, 2018 September 30, 2017 Amortized Cost Fair Value Amortized Cost Fair Value (In thousands) Cash and Cash Equivalents: Cash $ 71,610 $ 71,610 $ 90,323 $ 90,323 Money market funds 13,813 13,813 6,471 6,471 Bank time deposits 4,600 4,600 8,824 8,824 Total $ 90,023 $ 90,023 $ 105,618 $ 105,618 Long-term Marketable Securities: Marketable securities $ 14,313 $ 18,059 $ 10,788 $ 13,791

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value, Assets Measured on Recurring Basis	The following table represents financial assets that we measured at fair value on a recurring basis at September 30, 2018 and 2017 : September 30, 2018 Active Markets for Identical Instruments (Level 1) Fair Value as of September 30, 2018 (In thousands) Assets: Cash equivalents (1) $ 18,413 $ 18,413 Marketable securities (2) 18,059 18,059 Total $ 36,472 $ 36,472 September 30, 2017 Active Markets for Identical Instruments (Level 1) Fair Value as of September 30, 2017 (In thousands) Assets: Cash equivalents (1) $ 15,295 $ 15,295 Marketable securities (2) 13,791 13,791 Total $ 29,086 $ 29,086 (1) Included in cash and cash equivalents on our balance sheet at September 30, 2018 and 2017 . Not included in this table are cash deposits of $71.6 million and $90.3 million at September 30, 2018 and 2017 , respectively. (2) Represents securities held under a supplemental retirement and savings plan for certain officers and senior management employees, which are distributed upon termination or retirement of the employees. Included in long-term marketable securities on our consolidated balance sheets at September 30, 2018 and 2017 .

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	12 Months Ended
	Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Notional Amounts of Outstanding Derivative Positions	The following tables summarize our outstanding foreign currency forward contracts, by currency at September 30, 2018 and 2017 : September 30, 2018 Contract Amount Fair Value Foreign Currency US$ US$ (In thousands) Sell foreign currency: Euro (EUR) EUR 9,000 $ 10,372 — Buy foreign currency: British pound (GBP) GBP 8,598 $ 11,200 — Singapore dollar (SGD) SGD 9,580 $ 7,000 — September 30, 2017 Contract Amount Fair Value Foreign Currency US$ US$ (In thousands) Sell foreign currency: Euro (EUR) EUR 5,050 $ 5,968 — Buy foreign currency: British pound (GBP) GBP 9,341 $ 12,500 —
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance	These amounts are shown below for the years ended September 30, 2018, 2017 and 2016 : Year Ended September 30, 2018 2017 2016 (In thousands) Gain (loss) on foreign currency forward contracts $ (476 ) $ 210 $ (2,911 )

Receivables (Tables)

Receivables (Tables)	12 Months Ended
	Sep. 30, 2018
Receivables [Abstract]
Receivables	Accounts receivable, net at September 30, 2018 and 2017 consisted of the following: September 30, 2018 2017 (In thousands) Billed $ 157,333 $ 126,887 Unbilled (1) 54,971 44,640 212,304 171,527 Less: allowance for doubtful accounts (3,439 ) (2,941 ) Accounts receivable, net $ 208,865 $ 168,586 (1) Represents revenue recorded in excess of amounts billable pursuant to contract provisions and generally become billable at contractually specified dates or upon the attainment of milestones. Unbilled amounts are expected to be realized within one year.
Activity of Allowance for Doubtful Accounts	Activity in the allowance for doubtful accounts was as follows: Year Ended September 30, 2018 2017 (In thousands) Balance, beginning of year $ 2,941 $ 2,192 Add: expense 623 1,640 Less: write-offs (net of recoveries) (125 ) (891 ) Balance, end of year $ 3,439 $ 2,941

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets Subject to Amortization	Intangible assets that are subject to amortization consisted of the following at September 30, 2018 and 2017 : September 30, 2018 September 30, 2017 (In thousands, except average life) Gross Carrying Amount Accumulated Amortization Net Average Life Gross Carrying Amount Accumulated Amortization Net Average Life Completed technology $ 82,295 $ (77,400 ) $ 4,895 5 $ 84,955 $ (77,682 ) $ 7,273 5 Customer contracts and relationships 28,692 (19,051 ) 9,641 8 28,947 (15,091 ) 13,856 8 Trade names — — — 0 603 (547 ) 56 3 $ 110,987 $ (96,451 ) $ 14,536 6 $ 114,505 $ (93,320 ) $ 21,185 6
Schedule of Amortization Expense	Amortization expense associated with our intangible assets, which has been reflected as a separate operating expense caption within the accompanying consolidated statements of income and comprehensive income, consisted of the following during fiscal 2018, 2017 and 2016 : Year Ended September 30, 2018 2017 2016 (In thousands) Cost of revenues $ 2,380 $ 6,511 $ 7,300 Selling, general and administrative expenses 4,214 6,198 6,682 Total $ 6,594 $ 12,709 $ 13,982
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	Estimated future intangible asset amortization expense associated with intangible assets existing at September 30, 2018 , was as follows (in thousands): Year Ending September 30, 2019 $ 6,001 2020 3,647 2021 2,408 2022 2,263 2023 217 Thereafter — Total $ 14,536
Schedule of Goodwill	The following table summarizes changes to goodwill during fiscal 2018 and 2017 , both in total and as allocated to our operating segments. We have not recognized any goodwill impairment losses to date. Applications Scores Decision Management Software Total (In thousands) Balance at September 30, 2016 $ 582,720 $ 146,648 $ 69,047 $ 798,415 Foreign currency translation adjustment 5,568 — 431 5,999 Balance at September 30, 2017 588,288 146,648 69,478 804,414 Foreign currency translation adjustment (3,127 ) — (397 ) (3,524 ) Balance at September 30, 2018 $ 585,161 $ 146,648 $ 69,081 $ 800,890

Composition of Certain Financ_2

Composition of Certain Financial Statement Captions (Tables)	12 Months Ended
	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Property, Plant and Equipment	The following table presents the composition of property and equipment at September 30, 2018 and 2017 : September 30, 2018 2017 (In thousands) Property and equipment: Data processing equipment and software $ 104,789 $ 88,830 Office furniture and equipment 22,207 20,763 Leasehold improvements 29,158 25,767 Less: accumulated depreciation and amortization (107,317 ) (94,657 ) Total $ 48,837 $ 40,703

Senior Notes (Tables)

Senior Notes (Tables)	12 Months Ended
	Sep. 30, 2018
Debt Disclosure [Abstract]
Senior Notes	The 2008 Senior Notes were issued in four series as follows: Series Amount Interest Rate Maturity Date (In millions) A $ 41.0 6.37 % May 7, 2013 B $ 40.0 6.37 % May 7, 2015 C $ 63.0 6.71 % May 7, 2015 D $ 131.0 7.18 % May 7, 2018 The 2010 Senior Notes were issued in four series as follows: Series Amount Interest Rate Maturity Date (In millions) E $ 60.0 4.72 % July 14, 2016 F $ 72.0 5.04 % July 14, 2017 G $ 28.0 5.42 % July 14, 2019 H $ 85.0 5.59 % July 14, 2020
Principal Amounts Carrying amounts and Fair Values of Senior Notes	The following table presents the carrying amounts and fair values for the Senior Notes at September 30, 2018 and 2017 : September 30, 2018 September 30, 2017 Carrying Fair Value Carrying Fair Value (In thousands) The 2008 Senior Notes $ — $ — $ 131,000 $ 134,250 The 2010 Senior Notes 113,000 114,413 113,000 119,106 The 2018 Senior Notes 400,000 404,000 — — Total $ 513,000 $ 518,413 $ 244,000 $ 253,356
Future Principal Payments For the Senior Notes	Future principal payments for the Senior Notes are as follows (in thousands): Year Ending September 30, 2019 $ 28,000 2020 85,000 2021 — 2022 — 2023 — Thereafter 400,000 Total $ 513,000

Restructuring Expenses (Tables)

Restructuring Expenses (Tables)	12 Months Ended
	Sep. 30, 2018
Restructuring and Related Activities [Abstract]
Schedule of Restructuring and Related Costs	The following tables summarize our restructuring accruals associated with the above actions. The current portion and non-current portion was recorded in other accrued liabilities and other liabilities, respectively, within the accompanying consolidated balance sheets. Accrual at September 30, 2016 Expense Additions Cash Payments Accrual at September 30, 2017 (In thousands) Facilities charges $ 9,233 $ 1,729 $ (2,842 ) $ 8,120 Employee separation — 2,742 (2,557 ) 185 9,233 $ 4,471 $ (5,399 ) 8,305 Less: current portion (4,266 ) (3,077 ) Non-current $ 4,967 $ 5,228 Accrual at September 30, 2017 Expense Additions Cash Payments Accrual at September 30, 2018 (In thousands) Facilities charges $ 8,120 $ (2,892 ) $ 5,228 Employee separation 185 (185 ) — 8,305 $ — $ (3,077 ) 5,228 Less: current portion (3,077 ) (3,850 ) Non-current $ 5,228 $ 1,378

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Provision for Income Taxes	The provision for income taxes was as follows during fiscal 2018, 2017 and 2016 : Year ended September 30, 2018 2017 2016 (In thousands) Current: Federal $ 8,071 $ 19,576 $ 50,631 State 2,236 1,055 2,900 Foreign 9,559 8,486 7,597 19,866 29,117 61,128 Deferred: Federal 28,013 (5,027 ) (23,592 ) State 132 (296 ) (225 ) Foreign (2,416 ) (726 ) (2,190 ) 25,729 (6,049 ) (26,007 ) Total provision $ 45,595 $ 23,068 $ 35,121
Deferred Tax Assets and Liabilities	Deferred tax assets and liabilities at September 30, 2018 and 2017 were as follows: September 30, 2018 2017 (In thousands) Deferred tax assets: Loss and credit carryforwards $ 24,400 $ 34,383 Compensation benefits 30,388 45,823 Property and equipment — 3,476 Other assets 9,674 12,239 64,462 95,921 Less valuation allowance (19,564 ) (17,657 ) Total deferred tax assets 44,898 78,264 Deferred tax liabilities: Intangible assets (15,921 ) (25,346 ) Property and equipment (2,616 ) — Other liabilities (6,229 ) (5,714 ) Total deferred tax liabilities (24,766 ) (31,060 ) Deferred tax assets, net $ 20,132 $ 47,204
Reconciliation Between Federal Statutory Income Tax Rate and Effective Tax Rate	A reconciliation of the provision for income taxes, with the amount computed by applying the U.S. federal statutory income tax rate ( 24.5% in fiscal 2018, and 35% in fiscal 2017 and 2016) to income before provision for income taxes for fiscal 2018, 2017 and 2016 is shown below: Year Ended September 30, 2018 2017 2016 (In thousands) Income tax provision at U.S. federal statutory rate $ 46,119 $ 52,963 $ 50,599 State income taxes, net of U.S. federal benefit 3,429 2,193 2,244 Foreign tax rate differential (42 ) (1,761 ) (4,661 ) Intercompany interest — (477 ) (1,223 ) Research credits (3,486 ) (2,572 ) (4,398 ) Domestic production deduction (3,041 ) (3,075 ) (3,726 ) Amended returns/audit settlements/statute expirations (2,349 ) (1,296 ) (248 ) Foreign 4,040 744 (1,702 ) Valuation allowance 1,907 2,512 1,262 Foreign tax credit 1,320 (1,342 ) (3,286 ) Excess tax benefits relating to stock-based compensation (22,253 ) (24,746 ) — Tax effect of the Tax Act 23,579 — — Other (3,628 ) (75 ) 260 Recorded income tax provision $ 45,595 $ 23,068 $ 35,121
Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits	A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows: Year Ended September 30, 2018 2017 2016 (In thousands) Gross unrecognized tax benefits at beginning of year $ 6,480 $ 6,799 $ 4,634 Gross increases for tax positions in prior years 404 57 1,004 Gross decreases for tax positions in prior years — (19 ) (117 ) Gross increases based on tax positions related to the current year 1,625 1,291 1,310 Decreases for settlements and payments — (151 ) (32 ) Decreases due to statue expiration (2,396 ) (1,497 ) — Gross unrecognized tax benefits at end of year $ 6,113 $ 6,480 $ 6,799

Stock-Based Employee Benefit _2

Stock-Based Employee Benefit Plans (Tables)	12 Months Ended
	Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Assumptions Used to Estimate Fair Value of Stock Options	We used the following assumptions to estimate the fair value of our stock options during fiscal 2018, 2017 and 2016 : Year Ended September 30, 2018 2017 2016 Stock Options: Average expected term (years) 4.78 5.00 4.83 Expected volatility (range) 33.6 - 35.1 % 35.3 % 35.3 - 36.4 % Weighted average volatility 34.6 % 35.3 % 36.0 % Risk-free interest rate (range) 2.03 - 2.65 % 2.02 % 1.21 - 1.49 % Average expected dividend yield — % 0.07 % 0.09 % Expected dividend yield (range) — % 0.07 % 0.09 - 0.10 %
Summary of Option Activity	The following table summarizes option activity during fiscal 2018 : Shares Weighted- average Exercise Price Weighted- average Remaining Contractual Term Aggregate Intrinsic Value (In thousands) (In years) (In thousands) Outstanding at October 1, 2017 1,230 $ 56.54 Granted 29 167.27 Exercised (257 ) 42.85 Forfeited (6 ) 88.17 Outstanding at September 30, 2018 996 $ 63.13 2.51 $ 164,716 Exercisable at September 30, 2018 847 $ 59.10 2.31 $ 143,529 Vested and expected to vest at September 30, 2018 993 $ 62.97 2.50 $ 164,500
Summary of Restricted Stock Unit and Market Stock Unit Activity	The following table summarizes the RSUs activity during fiscal 2018 : Shares Weighted-average Grant-date Fair Value (In thousands) Outstanding at October 1, 2017 1,144 $ 97.95 Granted 458 161.85 Released (439 ) 88.21 Forfeited (50 ) 115.57 Outstanding at September 30, 2018 1,113 $ 127.34 The following table summarizes the MSUs activity during fiscal 2018 : Shares Weighted- average Grant-date Fair Value (In thousands) Outstanding at October 1, 2017 131 $ 123.82 Granted 102 151.78 Released (119 ) 113.70 Outstanding at September 30, 2018 114 $ 159.34
Summary of Performance Stock Unit Activity	The following table summarizes the PSUs activity during fiscal 2018 : Shares Weighted- average Grant-date Fair Value (In thousands) Outstanding at October 1, 2017 204 $ 105.37 Granted 102 157.17 Released (96 ) 98.15 Outstanding at September 30, 2018 210 $ 133.76
Assumptions Used to Estimate Fair Value of Market Stock Units	We used the following assumptions to estimate the fair value of our MSUs during fiscal 2018, 2017 and 2016 : Year Ended September 30, 2018 2017 2016 Expected volatility in FICO’s stock price 24.6 % 27.4 % 24.1 % Expected volatility in Russell 3000 Index 12.7 % 13.6 % 12.8 % Correlation between FICO and the Russell 3000 Index 63.1 % 59.8 % 60.2 % Risk-free interest rate 1.92 % 1.40 % 1.25 % Average expected dividend yield — % 0.07 % 0.09 %

Earnings per Share (Tables)

Earnings per Share (Tables)	12 Months Ended
	Sep. 30, 2018
Earnings Per Share [Abstract]
Reconciliation of Numerators and Denominators of Basic and Diluted Earnings Per Share	The following table presents reconciliations for the numerators and denominators of basic and diluted earnings per share (“EPS”) during fiscal 2018, 2017 and 2016 : Year Ended September 30, 2018 2017 2016 (In thousands, except per share data) Numerator for basic and diluted earnings per share — net income $ 142,415 $ 128,256 $ 109,448 Denominator — share: Basic weighted-average shares 29,711 30,862 31,129 Effect of dilutive securities 1,469 1,383 1,179 Diluted weighted-average shares 31,180 32,245 32,308 Earnings per share: Basic $ 4.79 $ 4.16 $ 3.52 Diluted $ 4.57 $ 3.98 $ 3.39

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Sep. 30, 2018
Revenue, Major Customer [Line Items]
Schedule of Segment Reporting Information, by Segment	The following tables summarize segment information for fiscal 2018, 2017 and 2016 : Year Ended September 30, 2018 Applications Scores Decision Management Software Unallocated Corporate Expenses Total (In thousands) Segment revenues: Transactional and maintenance $ 381,109 $ 337,530 $ 47,420 $ — $ 766,059 Professional services 142,908 1,751 32,145 — 176,804 License 61,554 3,367 24,691 — 89,612 Total segment revenues 585,571 342,648 104,256 — 1,032,475 Segment operating expense (420,995 ) (63,477 ) (134,903 ) (125,255 ) (744,630 ) Segment operating income (loss) $ 164,576 $ 279,171 $ (30,647 ) $ (125,255 ) $ 287,845 Unallocated share-based compensation expense (74,814 ) Unallocated amortization expense (6,594 ) Operating income 206,437 Unallocated interest expense, net (31,311 ) Unallocated other income, net 12,884 Income before income taxes $ 188,010 Depreciation expense $ 15,651 $ 555 $ 5,471 $ 956 $ 22,633 Year Ended September 30, 2017 Applications Scores Decision Management Software Unallocated Corporate Expenses Total (In thousands) Segment revenues: Transactional and maintenance $ 348,861 $ 259,780 $ 44,019 $ — $ 652,660 Professional services 141,857 2,849 34,863 — 179,569 License 62,449 3,725 33,766 — 99,940 Total segment revenues 553,167 266,354 112,648 — 932,169 Segment operating expense (393,667 ) (54,436 ) (123,466 ) (104,998 ) (676,567 ) Segment operating income (loss) $ 159,500 $ 211,918 $ (10,818 ) $ (104,998 ) 255,602 Unallocated share-based compensation expense (61,222 ) Unallocated amortization expense (12,709 ) Unallocated restructuring and acquisition-related expenses (4,471 ) Operating income 177,200 Unallocated interest expense, net (25,790 ) Unallocated other expense, net (86 ) Income before income taxes $ 151,324 Depreciation expense $ 15,857 $ 991 $ 4,783 $ 1,349 $ 22,980 Year Ended September 30, 2016 Applications Scores Decision Management Software Unallocated Corporate Expenses Total (In thousands) Segment revenues: Transactional and maintenance $ 328,472 $ 233,655 $ 43,792 $ — $ 605,919 Professional services 138,775 4,185 26,778 — 169,738 License 65,395 3,219 37,085 — 105,699 Total segment revenues 532,642 241,059 107,655 — 881,356 Segment operating expense (364,371 ) (55,975 ) (111,315 ) (110,612 ) (642,273 ) Segment operating income (loss) $ 168,271 $ 185,084 $ (3,660 ) $ (110,612 ) 239,083 Unallocated share-based compensation expense (55,509 ) Unallocated amortization expense (13,982 ) Operating income 169,592 Unallocated interest expense, net (26,633 ) Unallocated other income, net 1,610 Income before income taxes $ 144,569 Depreciation expense $ 11,852 $ 814 $ 3,657 $ 1,328 $ 17,651
Revenues and Percentage of Revenue by Reporting Segments	Our revenues and percentage of revenues by reportable market segments were as follows for fiscal 2018, 2017 and 2016 , the majority of which were derived from the sale of products and services within the banking (including consumer credit) industry: Year Ended September 30, 2018 2017 2016 (Dollars in thousands) Applications $ 585,571 57 % $ 553,167 59 % $ 532,642 61 % Scores 342,648 33 % 266,354 29 % 241,059 27 % Decision Management Software 104,256 10 % 112,648 12 % 107,655 12 % Total $ 1,032,475 100 % $ 932,169 100 % $ 881,356 100 %
Revenues and Percentage of Revenues on Geographical Basis	Our revenues and percentage of revenues on a geographical basis are summarized below for fiscal 2018, 2017 and 2016 : Year Ended September 30, 2018 2017 2016 (Dollars in thousands) United States $ 679,425 66 % $ 598,765 64 % $ 567,443 64 % United Kingdom 77,053 7 % 71,989 8 % 86,485 10 % Other countries 275,997 27 % 261,415 28 % 227,428 26 % Total $ 1,032,475 100 % $ 932,169 100 % $ 881,356 100 %
Revenues and Percentage of Revenues by Customers	Revenue generated from a single customer or a group of customers which represented 10% or greater of total revenue are summarized below for fiscal 2018, 2017 and 2016 : Year Ended September 30, 2018 2017 2016 (Dollars in thousands) Experian $ 109,638 11 % $ 80,347 9 % $ 65,753 8 % TransUnion and Equifax 143,922 14 % 104,475 11 % 97,427 11 % Other customers 778,915 75 % 747,347 80 % 718,176 81 % Total $ 1,032,475 100 % $ 932,169 100 % $ 881,356 100 %
Property and Equipment Net on Geographical Basis	Our property and equipment, net, on a geographical basis are summarized below at September 30, 2018 and 2017 : September 30, 2018 2017 (Dollars in thousands) United States $ 39,593 81 % $ 30,773 76 % United Kingdom 4,296 9 % 4,893 12 % Other countries 4,948 10 % 5,037 12 % Total $ 48,837 100 % $ 40,703 100 %

Commitments (Tables)

Commitments (Tables)	12 Months Ended
	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Minimum Future Commitments Under Non-Cancelable Operating Leases and Other Obligations	Minimum future commitments under non-cancelable operating leases and other obligations were as follows at September 30, 2018 : Year Ending September 30, Future Minimum Lease Commitments (In thousands) 2019 $ 24,224 2020 15,694 2021 15,768 2022 14,151 2023 12,866 Thereafter 33,030 Total $ 115,733

Supplementary Financial Data _2

Supplementary Financial Data (Unaudited) (Tables)	12 Months Ended
	Sep. 30, 2018
Quarterly Financial Information Disclosure [Abstract]
Selected Unaudited Consolidated Financial Results	The following table presents selected unaudited consolidated financial results for each of the eight quarters in the two-year period ended September 30, 2018 . In the opinion of management, this unaudited information has been prepared on the same basis as the audited information and includes all adjustments (consisting of only normal recurring adjustments, except as noted below) necessary for a fair statement of the consolidated financial information for the period presented. Quarter Ended September 30, June 30, March 31, December 31, (In thousands, except per share data) Revenues $ 279,791 $ 259,505 $ 257,858 $ 235,321 Cost of revenues (1) 79,431 78,390 78,519 74,359 Gross profit 200,360 181,115 179,339 160,962 Net income $ 50,480 $ 32,361 $ 32,275 $ 27,299 Earnings per share (2): Basic $ 1.74 $ 1.09 $ 1.08 $ 0.91 Diluted $ 1.64 $ 1.04 $ 1.03 $ 0.86 Shares used in computing earnings per share: Basic 29,077 29,708 29,985 30,078 Diluted 30,702 31,161 31,300 31,561 Quarter Ended September 30, June 30, March 31, December 31, (In thousands, except per share data) Revenues $ 253,205 $ 230,986 $ 228,378 $ 219,600 Cost of revenues (1) 75,202 69,793 72,131 69,997 Gross profit 178,003 161,193 156,247 149,603 Net income $ 40,044 $ 25,227 $ 25,084 $ 37,901 Earnings per share (2): Basic $ 1.31 $ 0.82 $ 0.81 $ 1.22 Diluted $ 1.25 $ 0.78 $ 0.78 $ 1.16 Shares used in computing earnings per share: Basic 30,534 30,914 31,017 30,989 Diluted 31,963 32,224 32,260 32,536 (1) Cost of revenues excludes amortization expense of $0.5 million , $0.6 million , $0.6 million , $0.7 million , $1.4 million , $1.7 million , $1.7 million and $1.7 million for the quarters ended September 30, 2018 , June 30, 2018 , March 31, 2018 , December 31, 2017 , September 30, 2017 , June 30, 2017 , March 31, 2017 and December 31, 2016 , respectively. (2) Earnings per share is computed independently for each of the quarters presented. Therefore, the sum of the quarterly per share amounts may not equal the totals for the respective years.

Nature of Business and Summar_4

Nature of Business and Summary of Significant Accounting Policies - Estimated Useful Life of Property and Equipment (Detail)	12 Months Ended
	Sep. 30, 2018
Data processing equipment and software | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	3 years
Data processing equipment and software | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	6 years
Office furniture and equipment | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	3 years
Office furniture and equipment | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	7 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	Shorter of estimated useful life or lease term

Nature of Business and Summar_5

Nature of Business and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Property, Plant and Equipment [Line Items]
Depreciation and amortization, property and equipment	$ 22.6	$ 23	$ 17.7
Foreign exchange gains (losses)	0.4	(1.1)	0.2
Advertising and promotion costs	$ 4.1	$ 3.1	$ 3.6
Minimum
Property, Plant and Equipment [Line Items]
Stock option awards vesting period	3 years
Maximum
Property, Plant and Equipment [Line Items]
Stock option awards vesting period	4 years
Internal-use Software | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	2 years
Internal-use Software | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	3 years

Nature of Business and Summar_6

Nature of Business and Summary of Significant Accounting Policies - Estimated Useful Life of Definite-Lived Intangible Assets (Detail)	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life	6 years	6 years
Completed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life	5 years	5 years
Completed technology | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life	4 years
Completed technology | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life	10 years
Customer contracts and relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life	8 years	8 years
Customer contracts and relationships | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life	5 years
Customer contracts and relationships | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life	15 years
Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life	0 years	3 years
Trade names | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life

Nature of Business and Summar_7

Nature of Business and Summary of Significant Accounting Policies - New Accounting Pronouncements (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Restatement Adjustment [Member] | Accounting Standards Update 2014-09 [Member] | Pro Forma [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ (32.3)	$ 2.8

Business Combinations - Additio

Business Combinations - Additional Information (Detail) $ in Thousands	12 Months Ended
	Sep. 30, 2018USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)
Business Acquisition [Line Items]
Number of businesses acquired	0	0
Goodwill	$ 800,890	$ 804,414	$ 798,415
QuadMetrics
Business Acquisition [Line Items]
Common stock acquired			100.00%
Cash consideration			$ 5,700
Intangible assets acquired			$ 2,000
Weighted average useful life			4 years
Goodwill			$ 3,900

Cash, Cash Equivalents and Ma_3

Cash, Cash Equivalents and Marketable Securities Available for Sale - Summary of Cash, Cash Equivalents and Marketable Securities Available for Sale (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Cash and Cash Equivalents
Cash, cash equivalents and marketable securities [Line Items]
Amortized Cost	$ 90,023	$ 105,618
Fair Value	90,023	105,618
Cash and Cash Equivalents | Cash
Cash, cash equivalents and marketable securities [Line Items]
Amortized Cost	71,610	90,323
Fair Value	71,610	90,323
Cash and Cash Equivalents | Money market funds
Cash, cash equivalents and marketable securities [Line Items]
Amortized Cost	13,813	6,471
Fair Value	13,813	6,471
Cash and Cash Equivalents | Bank Time Deposits
Cash, cash equivalents and marketable securities [Line Items]
Amortized Cost	4,600	8,824
Fair Value	4,600	8,824
Long-term Marketable Securities | Marketable securities
Cash, cash equivalents and marketable securities [Line Items]
Trading Securities, Cost	14,313	10,788
Debt Securities, Trading, and Equity Securities, FV-NI	$ 18,059	$ 13,791

Fair Value Measurements - Finan

Fair Value Measurements - Financial Assets Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands		Sep. 30, 2018	Sep. 30, 2017
Assets:
Total		$ 36,472	$ 29,086
Cash
Assets:
Cash equivalents	[1]	18,413	15,295
Marketable securities
Assets:
Debt Securities, Trading, and Equity Securities, FV-NI	[2]	18,059	13,791
Active Markets for Identical Instruments (Level 1)
Assets:
Total		36,472	29,086
Active Markets for Identical Instruments (Level 1) | Cash
Assets:
Cash equivalents	[1]	18,413	15,295
Active Markets for Identical Instruments (Level 1) | Marketable securities
Assets:
Debt Securities, Trading, and Equity Securities, FV-NI	[2]	$ 18,059	$ 13,791
[1]	Included in cash and cash equivalents on our balance sheet at September 30, 2018 and 2017. Not included in this table are cash deposits of $71.6 million and $90.3 million at September 30, 2018 and 2017, respectively.
[2]	Represents securities held under a supplemental retirement and savings plan for certain officers and senior management employees, which are distributed upon termination or retirement of the employees. Included in long-term marketable securities on our consolidated balance sheets at September 30, 2018 and 2017.

Fair Value Measurements - Fin_2

Fair Value Measurements - Financial Assets Measured at Fair Value on Recurring Basis - Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Sep. 30, 2017
Cash
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash deposits	$ 71.6	$ 90.3

Derivative Financial Instrume_3

Derivative Financial Instruments - Additional Information (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Derivative [Line Items]
Short-term forward contracts, average maturities at inception	3 months
Foreign Currency Forward Contracts
Derivative [Line Items]
Forward foreign currency contracts fair value	$ 0	$ 0

Derivative Financial Instrume_4

Derivative Financial Instruments - Summary of Outstanding Forward Foreign Currency Contracts by Currency (Detail) - Foreign Currency Forward Contracts - Not Designated as Hedging Instrument € in Thousands, £ in Thousands, $ in Thousands, $ in Thousands	Sep. 30, 2018GBP (£)	Sep. 30, 2018SGD ($)	Sep. 30, 2018EUR (€)	Sep. 30, 2018USD ($)	Sep. 30, 2017GBP (£)	Sep. 30, 2017EUR (€)	Sep. 30, 2017USD ($)
Foreign Exchange Contracts To Sell European Euro for US Dollar | Short
Derivative [Line Items]
Contract amount of forward foreign currency contracts			€ 9,000	$ 10,372		€ 5,050	$ 5,968
Fair value of forward foreign currency contracts to sell and buy foreign currency				0			0
Foreign Exchange Contracts To Purchase British Pounds With US Dollars | Long
Derivative [Line Items]
Contract amount of forward foreign currency contracts	£ 8,598			11,200	£ 9,341		12,500
Fair value of forward foreign currency contracts to sell and buy foreign currency				0			$ 0
Foreign Exchange Contracts To Purchase Singapore Dollars With United States Dollars | Long
Derivative [Line Items]
Contract amount of forward foreign currency contracts		$ 9,580		7,000
Fair value of forward foreign currency contracts to sell and buy foreign currency				$ 0

Derivative Financial Instrume_5

Derivative Financial Instruments - Gains Losses on Derivative Financial Instruments Recorded in Consolidated Statements of Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Foreign Currency Forward Contracts
Derivative [Line Items]
Gain (loss) on foreign currency forward contracts	$ (476)	$ 210	$ (2,911)

Receivables - Summary of Recei

Receivables - Summary of Receivables (Detail) - USD ($) $ in Thousands		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Receivables [Abstract]
Billed		$ 157,333	$ 126,887
Unbilled	[1]	54,971	44,640
Receivables, Gross, Current, Total		212,304	171,527
Less: allowance for doubtful accounts		(3,439)	(2,941)	$ (2,192)
Accounts receivable, net		$ 208,865	$ 168,586
[1]	Represents revenue recorded in excess of amounts billable pursuant to contract provisions and generally become billable at contractually specified dates or upon the attainment of milestones. Unbilled amounts are expected to be realized within one year.

Receivables - Activity of Allow

Receivables - Activity of Allowance for Doubtful Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, beginning of year	$ 2,941	$ 2,192
Add: expense	623	1,640	$ 2,011
Less: write-offs (net of recoveries)	(125)	(891)
Balance, end of year	$ 3,439	$ 2,941	$ 2,192

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 110,987	$ 114,505
Accumulated Amortization	(96,451)	(93,320)
Total	$ 14,536	$ 21,185
Average Life	6 years	6 years
Completed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 82,295	$ 84,955
Accumulated Amortization	(77,400)	(77,682)
Total	$ 4,895	$ 7,273
Average Life	5 years	5 years
Customer contracts and relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 28,692	$ 28,947
Accumulated Amortization	(19,051)	(15,091)
Total	$ 9,641	$ 13,856
Average Life	8 years	8 years
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 0	$ 603
Accumulated Amortization	0	(547)
Total	$ 0	$ 56
Average Life	0 years	3 years

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Amortization Expense Associated with Intangible Assets (Detail) - USD ($) $ in Thousands

3 Months Ended

12 Months Ended

Sep. 30, 2018

Jun. 30, 2018

Mar. 31, 2018

Dec. 31, 2017

Sep. 30, 2017

Jun. 30, 2017

Mar. 31, 2017

Dec. 31, 2016

Sep. 30, 2018

Sep. 30, 2017

Sep. 30, 2016

Finite-Lived Intangible Assets [Line Items]

Amortization expense of intangible assets

$ 500

$ 600

$ 600

$ 700

$ 1,400

$ 1,700

$ 1,700

$ 1,700

$ 6,594

[1]

$ 12,709

[1]

$ 13,982

[1]

Cost of revenues

Finite-Lived Intangible Assets [Line Items]

Amortization expense of intangible assets

2,380

6,511

7,300

Selling, general and administrative expenses

Finite-Lived Intangible Assets [Line Items]

Amortization expense of intangible assets

$ 4,214

$ 6,198

$ 6,682

[1]

Cost of revenues and selling, general and administrative expenses exclude the amortization of intangible assets. See Note 7.

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Estimated Future Intangible Asset Amortization Expense (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Estimated future intangible asset amortization expense
2,018	$ 6,001
2,019	3,647
2,020	2,408
2,021	2,263
2,022	217
Thereafter	0
Total	$ 14,536	$ 21,185

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets - Summary of Changes to Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Goodwill [Roll Forward]
Beginning Balance	$ 804,414	$ 798,415
Foreign currency translation adjustment	(3,524)	5,999
Ending Balance	800,890	804,414
Applications
Goodwill [Roll Forward]
Beginning Balance	588,288	582,720
Foreign currency translation adjustment	(3,127)	5,568
Ending Balance	585,161	588,288
Scores
Goodwill [Roll Forward]
Beginning Balance	146,648	146,648
Foreign currency translation adjustment	0	0
Ending Balance	146,648	146,648
Decision Management Software
Goodwill [Roll Forward]
Beginning Balance	69,478	69,047
Foreign currency translation adjustment	(397)	431
Ending Balance	$ 69,081	$ 69,478

Composition of Certain Financ_3

Composition of Certain Financial Statement Captions - Property and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Property and equipment:
Data processing equipment and software	$ 104,789	$ 88,830
Office furniture and equipment	22,207	20,763
Leasehold improvements	29,158	25,767
Less: accumulated depreciation and amortization	(107,317)	(94,657)
Total	$ 48,837	$ 40,703

Revolving Line of Credit - Addi

Revolving Line of Credit - Additional Information (Detail)	May 08, 2018USD ($)	Sep. 30, 2018USD ($)
Line of Credit Facility [Line Items]
Line of credit, current borrowing capacity	$ 400,000,000
Line of credit, option to increase borrowing capacity	$ 100,000,000
Revolving credit facility, expiration date	May 8, 2023
Credit facility restrictive covenant, minimum fixed charge ratio	2.50
Interest coverage ratio	3
Credit facility restrictive covenant, maximum consolidated leverage ratio	3.25
Credit facility restrictive covenant, maximum consolidated leverage ratio step up	3.75
Borrowings outstanding		$ 257,000,000
Interest rate of borrowings outstanding		3.555%
Long-term debt
Line of Credit Facility [Line Items]
Borrowings outstanding		$ 50,000,000
Federal Fund Rate
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate	0.50%
LIBOR
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate	1.00%
LIBOR | Minimum
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate	1.00%
LIBOR | Maximum
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate	1.875%
Base Rate | Minimum
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate	0.00%
Base Rate | Maximum
Line of Credit Facility [Line Items]
Debt instrument basis spread on variable rate	0.875%

Senior Notes - Additional Infor

Senior Notes - Additional Information (Detail)	Jul. 14, 2010USD ($)Contract	Sep. 30, 2018USD ($)	May 08, 2018USD ($)	Sep. 30, 2017USD ($)	May 07, 2008USD ($)Contract
Debt Disclosure [Line Items]
Debt Issuance Costs, Net		$ 6,100,000		$ 200,000
May 2008 Senior Notes
Debt Disclosure [Line Items]
Senior Notes issued in a private placement to a group of institutional investors					$ 275,000,000
Number of series of Senior Notes issued | Contract					4
July 2010 Senior Notes
Debt Disclosure [Line Items]
Senior Notes issued in a private placement to a group of institutional investors	$ 245,000,000
Number of series of Senior Notes issued | Contract	4
Debt Instrument, Covenant, Leverage Ratio, Maximum	3
Debt Instrument, Covenant, Fixed Charge Coverage Ratio, Minimum	2.50
May 2018 Senior Notes
Debt Disclosure [Line Items]
Senior Notes issued in a private placement to a group of institutional investors			$ 400,000,000

Senior Notes - Summary of Senio

Senior Notes - Summary of Senior Notes (Detail) - USD ($) $ in Millions	May 08, 2018	Jul. 14, 2010	May 07, 2008
May 2018 Senior Notes
Debt Instrument [Line Items]
Interest rate	5.25%
Maturity date	May 15, 2026
Series A
Debt Instrument [Line Items]
Amount			$ 41
Interest rate			6.37%
Maturity date			May 7, 2013
Series B
Debt Instrument [Line Items]
Amount			$ 40
Interest rate			6.37%
Maturity date			May 7, 2015
Series C
Debt Instrument [Line Items]
Amount			$ 63
Interest rate			6.71%
Maturity date			May 7, 2015
Series D
Debt Instrument [Line Items]
Amount			$ 131
Interest rate			7.18%
Maturity date			May 7, 2018
Series E
Debt Instrument [Line Items]
Amount		$ 60
Interest rate		4.72%
Maturity date		Jul. 14, 2016
Series F
Debt Instrument [Line Items]
Amount		$ 72
Interest rate		5.04%
Maturity date		Jul. 14, 2017
Series G
Debt Instrument [Line Items]
Amount		$ 28
Interest rate		5.42%
Maturity date		Jul. 14, 2019
Series H
Debt Instrument [Line Items]
Amount		$ 85
Interest rate		5.59%
Maturity date		Jul. 14, 2020

Senior Notes - Principal Amount

Senior Notes - Principal Amounts Carrying Amounts and Fair Values of Senior Notes (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Debt Instrument [Line Items]
Carrying amounts	$ 513,000	$ 244,000
Fair value	518,413	253,356
Debt issuance costs, net	(6,100)	(200)
May 2008 Senior Notes
Debt Instrument [Line Items]
Carrying amounts	0	131,000
Fair value	0	134,250
July 2010 Senior Notes
Debt Instrument [Line Items]
Carrying amounts	113,000	113,000
Fair value	114,413	119,106
May 2018 Senior Notes
Debt Instrument [Line Items]
Carrying amounts	400,000	0
Fair value	$ 404,000	$ 0

Senior Notes - Future Principal

Senior Notes - Future Principal Payments For Senior Notes (Detail) $ in Thousands	Sep. 30, 2018USD ($)
Debt Disclosure [Abstract]
2,019	$ 28,000
2,020	85,000
2,021	0
2,022	0
2,023	0
Thereafter	400,000
Total	$ 513,000

Employee Benefit Plans - Additi

Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Retirement Benefits [Abstract]
Eligible employees contribution to 401(k) plan (up to 25%)	25.00%
Employer contributions into 401(k) plans	$ 8.8	$ 8.4	$ 7.3
Employee incentive plans expenses	$ 48.4	$ 41.6	$ 40

Restructuring Expenses - Additi

Restructuring Expenses - Additional Information (Detail)	12 Months Ended
	Sep. 30, 2018USD ($)	Sep. 30, 2017USD ($)position	Sep. 30, 2016USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0	$ 4,471,000	$ 0
Number of positions reduced | position		79
Facilities charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 1,729,000
Employee separation
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 2,742,000

Restructuring Expenses - Summar

Restructuring Expenses - Summary of Restructuring Accruals and Certain Facility Closures (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Restructuring Reserve [Roll Forward]
Beginning balance	$ 8,305,000	$ 9,233,000
Expense additions	0	4,471,000	$ 0
Cash payments	(3,077,000)	(5,399,000)
Ending balance	5,228,000	8,305,000	9,233,000
Less: current portion	(3,850,000)	(3,077,000)	(4,266,000)
Non-current	1,378,000	5,228,000	4,967,000
Facilities charges
Restructuring Reserve [Roll Forward]
Beginning balance	8,120,000	9,233,000
Expense additions		1,729,000
Cash payments	(2,892,000)	(2,842,000)
Ending balance	5,228,000	8,120,000	9,233,000
Employee separation
Restructuring Reserve [Roll Forward]
Beginning balance	185,000	0
Expense additions		2,742,000
Cash payments	(185,000)	(2,557,000)
Ending balance	$ 0	$ 185,000	$ 0

Income Taxes - Provision for In

Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Current:
Federal	$ 8,071	$ 19,576	$ 50,631
State	2,236	1,055	2,900
Foreign	9,559	8,486	7,597
Current income tax	19,866	29,117	61,128
Deferred:
Federal	28,013	(5,027)	(23,592)
State	132	(296)	(225)
Foreign	(2,416)	(726)	(2,190)
Deferred income taxes	25,729	(6,049)	(26,007)
Total provision	$ 45,595	$ 23,068	$ 35,121

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		24.50%	35.00%	35.00%
Foreign pretax earnings		$ 13,000	$ 27,800	$ 33,000
Current foreign tax expense related to foreign tax withholdings		6,000	4,600	6,500
Unrecognized tax benefits		6,113	$ 6,480	$ 6,799	$ 4,634
Unrecognized tax benefits that would impact the effective tax rate if recognized		5,800
Unrecognized tax benefits, accrued interest		300
Unremitted earnings of foreign subsidiaries		79,700
Deemed Repatriation of Earnings of Foreign Subsidiaries		57,900
Tax Cuts and Jobs Act of 2017, Income Tax Expense, Non-deductibility of Performance-based Compensation, Provisional Amount		6,000
Tax Cuts and Jobs Act of 2017, Transition Tax for Accumulated Foreign Earnings, Income Tax Expense (Benefit), Incomplete Accounting, Provisional Amount		3,600
Tax Cuts and Jobs Act of 2017, Income Tax Expense (Benefit), Incomplete Accounting for Tax Effects, Provisional Amount		9,600
Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Deferred Tax Asset and Liability, Income Tax (Expense) Benefit		14,000
California Franchise Tax Board | Research Tax Credit Carryforward
Income Taxes [Line Items]
Excess state research credit		10,500
Valuation allowance		10,500
U.S. Federal
Income Taxes [Line Items]
Net operating loss carryforwards		$ 13,700
Net operating loss carryforwards expiration dates		2,020
State
Income Taxes [Line Items]
Net operating loss carryforwards		$ 200
Net operating loss carryforwards expiration dates		2,021
Foreign NOL carryforwards
Income Taxes [Line Items]
Net operating loss carryforwards		$ 41,900
Foreign NOL carryforwards | China
Income Taxes [Line Items]
Net operating loss carryforwards		$ 25,100
Scenario, Forecast [Member]
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%

Income Taxes - Deferred Tax Ass

Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Deferred tax assets:
Loss and credit carryforwards	$ 24,400	$ 34,383
Compensation benefits	30,388	45,823
Property and equipment	0	3,476
Other assets	9,674	12,239
Deferred tax assets, gross	64,462	95,921
Less valuation allowance	(19,564)	(17,657)
Total deferred tax assets	44,898	78,264
Deferred tax liabilities:
Intangible assets	(15,921)	(25,346)
Property and equipment	(2,616)	0
Other liabilities	(6,229)	(5,714)
Total deferred tax liabilities	(24,766)	(31,060)
Deferred tax assets, net	$ 20,132	$ 47,204

Income Taxes - Reconciliation B

Income Taxes - Reconciliation Between Federal Statutory Income Tax Rate and Effective Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	24.50%	35.00%	35.00%
Income tax provision at U.S. federal statutory rate	$ 46,119	$ 52,963	$ 50,599
State income taxes, net of U.S. federal benefit	3,429	2,193	2,244
Foreign tax rate differential	(42)	(1,761)	(4,661)
Intercompany interest	0	(477)	(1,223)
Research credits	(3,486)	(2,572)	(4,398)
Domestic production deduction	(3,041)	(3,075)	(3,726)
Amended returns/audit settlements/statute expirations	(2,349)	(1,296)	(248)
Foreign	4,040	744	(1,702)
Valuation allowance	1,907	2,512	1,262
Foreign tax credit	1,320	(1,342)	(3,286)
Excess tax benefits relating to stock-based compensation	(22,253)	(24,746)	0
Tax effect of the Tax Act	23,579	0	0
Other	(3,628)	(75)	260
Total provision	$ 45,595	$ 23,068	$ 35,121

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross unrecognized tax benefits at beginning of year	$ 6,480	$ 6,799	$ 4,634
Gross increases for tax positions in prior years	404	57	1,004
Gross decreases for tax positions in prior years	0	(19)	(117)
Gross increases based on tax positions related to the current year	1,625	1,291	1,310
Decreases for settlements and payments	0	(151)	(32)
Decreases due to statue expiration	(2,396)	(1,497)	0
Gross unrecognized tax benefits at end of year	$ 6,113	$ 6,480	$ 6,799

Stock-Based Employee Benefit _3

Stock-Based Employee Benefit Plans - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 74.8	$ 61.2	$ 55.5
Tax benefit related to share-based compensation expense	15.7	$ 20.4	$ 18.7
Unrecognized compensation cost related to non-vested share-based compensation arrangements	$ 105.1
Unrecognized compensation cost, weighted average recognition period	2 years 4 months
Cash received from stock option exercises	$ 11
Tax benefit from the stock option exercises	$ 10.7
Weighted average fair value of options granted (in dollars per share)	$ 56.61	$ 43.80	$ 31.06
Number of options that had exercise prices lower than the market price of common stock (in shares)	1,000,000
Market price of common stock (in dollars per share)	$ 228.55
Total intrinsic value of options exercised	$ 41.4	$ 27	$ 41.3
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option awards vesting period	4 years
Restricted stock units and non-vested shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value of restricted stock units, performance stock units, and market stock units (in dollars per share)	$ 161.85	$ 122.47	$ 94.77
Total intrinsic value of restricted stock units, performance stock units, and market stock units	$ 70.7	$ 58.7	$ 49.8
Awards granted in period (in shares)	458,000
Restricted stock units subject to market conditions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option awards vesting period	3 years
Performance stock units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value of restricted stock units, performance stock units, and market stock units (in dollars per share)	$ 157.17	$ 121.30	$ 91.74
Total intrinsic value of restricted stock units, performance stock units, and market stock units	$ 15.1	$ 16.6	$ 14
Awards granted in period (in shares)	102,000
Market stock units (MSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value of restricted stock units, performance stock units, and market stock units (in dollars per share)	$ 151.78	$ 108.09	$ 100.63
Total intrinsic value of restricted stock units, performance stock units, and market stock units	$ 18.7	$ 20.2	$ 9.2
Awards granted in period (in shares)	102,000
Market stock units (MSUs) | Performance period year one
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	1 year
Market stock units (MSUs) | Performance period year two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	2 years
Market stock units (MSUs) | Performance period year three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	3 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option awards vesting period	4 years
Maximum | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option awards term	7 years
Maximum | Performance stock units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance condition payout (percent)	200.00%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option awards vesting period	3 years
Minimum | Performance stock units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance condition payout (percent)	0.00%
2012 Long-Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grants under stock plan (in shares)	4,202,040
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grants under stock plan (in shares)	2,707,966
Authorized shares of common stock for grant under stock plan (in shares)	5,062,500
Employee stock purchase plans, percentage of salary withheld through payroll deductions to purchase FICO common stock (up to 10%)	10.00%
Employee stock purchase plans, purchase price of the stock as a percentage of fair market value on the exercise date	85.00%
Employee stock purchase plans, offering period (in months)	6 months

Stock-Based Employee Benefit _4

Stock-Based Employee Benefit Plans - Assumptions Used to Estimate Fair Value of Stock Options (Detail)	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Average expected term (years)	4 years 9 months 10 days	5 years	4 years 10 months
Expected volatility		35.30%
Expected volatility (range), minimum	33.60%		35.30%
Expected volatility (range), maximum	35.10%		36.40%
Weighted average volatility	34.60%	35.30%	36.00%
Risk free interest rate		2.02%
Risk free interest rate, minimum	2.03%		1.21%
Risk free interest rate, maximum	2.65%		1.49%
Average expected dividend yield	0.00%	0.07%	0.09%
Expected dividend yield (range), minimum	0.00%	0.07%	0.09%
Expected dividend yield (range), maximum	0.00%	0.07%	0.10%

Stock-Based Employee Benefit _5

Stock-Based Employee Benefit Plans - Summary of Option Activity (Detail) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2018USD ($)$ / sharesshares
Shares
Outstanding at October 1, 2017 (in shares) | shares	1,230
Granted (in shares) | shares	29
Exercised (in shares) | shares	(257)
Forfeited (in shares) | shares	(6)
Outstanding at September 30, 2018 (in shares) | shares	996
Options exercisable at September 30, 2018 (in shares) | shares	847
Vested and expected to vest at September 30, 2018 (in shares) | shares	993
Weighted- average Exercise Price
Outstanding at October 1, 2017 (in dollars per share) | $ / shares	$ 56.54
Granted (in dollars per share) | $ / shares	167.27
Exercised (in dollars per share) | $ / shares	42.85
Forfeited (in dollars per share) | $ / shares	88.17
Outstanding at September 30, 2018 (in dollars per share) | $ / shares	63.13
Options exercisable at September 30, 2018 (in dollars per share) | $ / shares	59.10
Vested and expected to vest at September 30, 2018 (in dollars per share) | $ / shares	$ 62.97
Weighted- average Remaining Contractual Term
Outstanding at September 30, 2018	2 years 6 months 2 days
Exercisable at September 30, 2018	2 years 3 months 23 days
Vested and expected to vest at September 30, 2018	2 years 6 months
Aggregate Intrinsic Value
Outstanding at September 30, 2018 | $	$ 164,716
Exercisable at September 30, 2018 | $	143,529
Vested and expected to vest at September 30, 2017 | $	$ 164,500

Stock-Based Employee Benefit _6

Stock-Based Employee Benefit Plans - Summary of Restricted Stock Unit and Performance Stock Unit Activity (Detail) - $ / shares shares in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Restricted stock units (RSUs)
Shares
Outstanding at October 1, 2017 (in shares)	1,144
Granted (in shares)	458
Released (in shares)	(439)
Forfeited (in shares)	(50)
Outstanding at September 30, 2018 (in shares)	1,113	1,144
Weighted-average Grant-date Fair Value
Outstanding at October 1, 2017 (in dollars per share)	$ 97.95
Granted (in dollars per share)	161.85	$ 122.47	$ 94.77
Released (in dollars per share)	88.21
Forfeited (in dollars per share)	115.57
Outstanding at September 30, 2018 (in dollars per share)	$ 127.34	$ 97.95
Performance stock units (PSUs)
Shares
Outstanding at October 1, 2017 (in shares)	204
Granted (in shares)	102
Released (in shares)	(96)
Outstanding at September 30, 2018 (in shares)	210	204
Weighted-average Grant-date Fair Value
Outstanding at October 1, 2017 (in dollars per share)	$ 105.37
Granted (in dollars per share)	157.17	$ 121.30	91.74
Released (in dollars per share)	98.15
Outstanding at September 30, 2018 (in dollars per share)	$ 133.76	$ 105.37
Market stock units (MSUs)
Shares
Outstanding at October 1, 2017 (in shares)	131
Granted (in shares)	102
Released (in shares)	(119)
Outstanding at September 30, 2018 (in shares)	114	131
Weighted-average Grant-date Fair Value
Outstanding at October 1, 2017 (in dollars per share)	$ 123.82
Granted (in dollars per share)	151.78	$ 108.09	$ 100.63
Released (in dollars per share)	113.70
Outstanding at September 30, 2018 (in dollars per share)	$ 159.34	$ 123.82

Stock-Based Employee Benefit _7

Stock-Based Employee Benefit Plans - Assumptions Used to Estimate Fair Value of Market Stock Units (Details)	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility in FICO’s stock price		35.30%
Risk-free interest rate		2.02%
Average expected dividend yield	0.00%	0.07%	0.09%
Market stock units (MSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility in FICO’s stock price	24.60%	27.40%	24.10%
Expected volatility in Russell 3000 Index	12.70%	13.60%	12.80%
Correlation between FICO and the Russell 3000 Index	63.10%	59.80%	60.20%
Risk-free interest rate	1.92%	1.40%	1.25%
Average expected dividend yield	0.00%	0.07%	0.09%

Earnings per Share - Reconcilia

Earnings per Share - Reconciliation of Numerators and Denominators of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended																12 Months Ended
	Sep. 30, 2018		Jun. 30, 2018		Mar. 31, 2018		Dec. 31, 2017		Sep. 30, 2017		Jun. 30, 2017		Mar. 31, 2017		Dec. 31, 2016		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Numerator for basic and diluted earnings per share
Net income	$ 50,480		$ 32,361		$ 32,275		$ 27,299		$ 40,044		$ 25,227		$ 25,084		$ 37,901		$ 142,415	$ 128,256	$ 109,448
Denominator — share:
Basic weighted-average shares (in shares)	29,077		29,708		29,985		30,078		30,534		30,914		31,017		30,989		29,711	30,862	31,129
Effect of dilutive securities (in shares)																	1,469	1,383	1,179
Diluted weighted-average shares (in shares)	30,702		31,161		31,300		31,561		31,963		32,224		32,260		32,536		31,180	32,245	32,308
Earnings per share:
Basic (in dollars per share)	$ 1.74	[1]	$ 1.09	[1]	$ 1.08	[1]	$ 0.91	[1]	$ 1.31	[1]	$ 0.82	[1]	$ 0.81	[1]	$ 1.22	[1]	$ 4.79	$ 4.16	$ 3.52
Diluted (in dollars per share)	$ 1.64	[1]	$ 1.04	[1]	$ 1.03	[1]	$ 0.86	[1]	$ 1.25	[1]	$ 0.78	[1]	$ 0.78	[1]	$ 1.16	[1]	$ 4.57	$ 3.98	$ 3.39
[1]	Earnings per share is computed independently for each of the quarters presented. Therefore, the sum of the quarterly per share amounts may not equal the totals for the respective years.

Earnings per Share - Additional

Earnings per Share - Additional Information (Detail) - shares shares in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Options to purchase shares of common stock excluded in the computation of diluted earnings per share because their inclusion would be antidilutive (in shares)	5	8	9

Segment Information - Summary o

Segment Information - Summary of Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018		Sep. 30, 2017		Sep. 30, 2016
Segment revenues:
Revenues	$ 279,791	$ 259,505	$ 257,858	$ 235,321	$ 253,205	$ 230,986	$ 228,378	$ 219,600	$ 1,032,475		$ 932,169		$ 881,356
Segment operating expense									(826,038)		(754,969)		(711,764)
Operating income									206,437		177,200		169,592
Unallocated share-based compensation expense									(74,814)		(61,222)		(55,509)
Unallocated amortization expense	$ (500)	$ (600)	$ (600)	$ (700)	$ (1,400)	$ (1,700)	$ (1,700)	$ (1,700)	(6,594)	[1]	(12,709)	[1]	(13,982)	[1]
Unallocated restructuring and acquisition-related expenses									0		(4,471)		0
Unallocated interest expense, net									(31,311)		(25,790)		(26,633)
Unallocated other income (expense), net									12,884		(86)		1,610
Income before income taxes									188,010		151,324		144,569
Depreciation expense									22,633		22,980		17,651
Applications
Segment revenues:
Revenues									585,571		553,167		532,642
Scores
Segment revenues:
Revenues									342,648		266,354		241,059
Decision Management Software
Segment revenues:
Revenues									104,256		112,648		107,655
Operating Segments
Segment revenues:
Segment operating expense									(744,630)		(676,567)		(642,273)
Operating income									287,845		255,602		239,083
Operating Segments | Applications
Segment revenues:
Revenues									585,571		553,167		532,642
Segment operating expense									(420,995)		(393,667)		(364,371)
Operating income									164,576		159,500		168,271
Depreciation expense									15,651		15,857		11,852
Operating Segments | Scores
Segment revenues:
Revenues									342,648		266,354		241,059
Segment operating expense									(63,477)		(54,436)		(55,975)
Operating income									279,171		211,918		185,084
Depreciation expense									555		991		814
Operating Segments | Decision Management Software
Segment revenues:
Revenues									104,256		112,648		107,655
Segment operating expense									(134,903)		(123,466)		(111,315)
Operating income									(30,647)		(10,818)		(3,660)
Depreciation expense									5,471		4,783		3,657
Unallocated Corporate Expenses
Segment revenues:
Segment operating expense									(125,255)		(104,998)		(110,612)
Operating income									(125,255)		(104,998)		(110,612)
Depreciation expense									956		1,349		1,328
Transactional and maintenance
Segment revenues:
Revenues									766,059		652,660		605,919
Transactional and maintenance | Operating Segments | Applications
Segment revenues:
Revenues									381,109		348,861		328,472
Transactional and maintenance | Operating Segments | Scores
Segment revenues:
Revenues									337,530		259,780		233,655
Transactional and maintenance | Operating Segments | Decision Management Software
Segment revenues:
Revenues									47,420		44,019		43,792
Professional services
Segment revenues:
Revenues									176,804		179,569		169,738
Professional services | Operating Segments | Applications
Segment revenues:
Revenues									142,908		141,857		138,775
Professional services | Operating Segments | Scores
Segment revenues:
Revenues									1,751		2,849		4,185
Professional services | Operating Segments | Decision Management Software
Segment revenues:
Revenues									32,145		34,863		26,778
License
Segment revenues:
Revenues									89,612		99,940		105,699
License | Operating Segments | Applications
Segment revenues:
Revenues									61,554		62,449		65,395
License | Operating Segments | Scores
Segment revenues:
Revenues									3,367		3,725		3,219
License | Operating Segments | Decision Management Software
Segment revenues:
Revenues									$ 24,691		$ 33,766		$ 37,085
[1]	Cost of revenues and selling, general and administrative expenses exclude the amortization of intangible assets. See Note 7.

Segment Information - Revenues

Segment Information - Revenues And Percentage Of Revenues By Reportable Market Segments (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Revenues	$ 279,791	$ 259,505	$ 257,858	$ 235,321	$ 253,205	$ 230,986	$ 228,378	$ 219,600	$ 1,032,475	$ 932,169	$ 881,356
Product Concentration Risk | Sales Revenue
Segment Reporting Information [Line Items]
Concentration of risk, Percentage									100.00%	100.00%	100.00%
Applications
Segment Reporting Information [Line Items]
Revenues									$ 585,571	$ 553,167	$ 532,642
Applications | Product Concentration Risk | Sales Revenue
Segment Reporting Information [Line Items]
Concentration of risk, Percentage									57.00%	59.00%	61.00%
Scores
Segment Reporting Information [Line Items]
Revenues									$ 342,648	$ 266,354	$ 241,059
Scores | Product Concentration Risk | Sales Revenue
Segment Reporting Information [Line Items]
Concentration of risk, Percentage									33.00%	29.00%	27.00%
Decision Management Software
Segment Reporting Information [Line Items]
Revenues									$ 104,256	$ 112,648	$ 107,655
Decision Management Software | Product Concentration Risk | Sales Revenue
Segment Reporting Information [Line Items]
Concentration of risk, Percentage									10.00%	12.00%	12.00%

Segment Information - Additiona

Segment Information - Additional Information (Detail)	12 Months Ended
	Sep. 30, 2018Segmentcustomer	Sep. 30, 2017customer	Sep. 30, 2016
Segment Reporting Information [Line Items]
Number of reportable segments | Segment	3
Sales Revenue | Product Concentration Risk
Segment Reporting Information [Line Items]
Concentration of risk, Percentage	100.00%	100.00%	100.00%
Sales Revenue | Product Concentration Risk | Applications
Segment Reporting Information [Line Items]
Concentration of risk, Percentage	57.00%	59.00%	61.00%
Sales Revenue | Product Concentration Risk | Applications | Fraud Solutions
Segment Reporting Information [Line Items]
Concentration of risk, Percentage	17.00%	19.00%	20.00%
Sales Revenue | Product Concentration Risk | Applications | Customer Cummunication Services
Segment Reporting Information [Line Items]
Concentration of risk, Percentage	10.00%	10.00%	9.00%
Sales Revenue | Product Concentration Risk | Applications | Customer Management Solutions
Segment Reporting Information [Line Items]
Concentration of risk, Percentage	8.00%	8.00%	9.00%
Sales Revenue | Customer Concentration Risk
Segment Reporting Information [Line Items]
Concentration of risk, Percentage	100.00%	100.00%	100.00%
Accounts Receivable | Customer Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk, number of customers | customer	0	0

Segment Information - Revenue_2

Segment Information - Revenues and Percentage of Revenues on Geographical Basis (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Revenues	$ 279,791	$ 259,505	$ 257,858	$ 235,321	$ 253,205	$ 230,986	$ 228,378	$ 219,600	$ 1,032,475	$ 932,169	$ 881,356
United States
Segment Reporting Information [Line Items]
Revenues									679,425	598,765	567,443
United Kingdom
Segment Reporting Information [Line Items]
Revenues									77,053	71,989	86,485
Other countries
Segment Reporting Information [Line Items]
Revenues									$ 275,997	$ 261,415	$ 227,428
Geographic Concentration Risk | Sales Revenue
Segment Reporting Information [Line Items]
Concentration of risk, Percentage									100.00%	100.00%	100.00%
Geographic Concentration Risk | United States | Sales Revenue
Segment Reporting Information [Line Items]
Concentration of risk, Percentage									66.00%	64.00%	64.00%
Geographic Concentration Risk | United Kingdom | Sales Revenue
Segment Reporting Information [Line Items]
Concentration of risk, Percentage									7.00%	8.00%	10.00%
Geographic Concentration Risk | Other countries | Sales Revenue
Segment Reporting Information [Line Items]
Concentration of risk, Percentage									27.00%	28.00%	26.00%

Segment Information - Property

Segment Information - Property and Equipment Net on Geographical Basis (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Property and equipment, net	$ 48,837	$ 40,703
United States
Segment Reporting Information [Line Items]
Property and equipment, net	39,593	30,773
United Kingdom
Segment Reporting Information [Line Items]
Property and equipment, net	4,296	4,893
Other countries
Segment Reporting Information [Line Items]
Property and equipment, net	$ 4,948	$ 5,037
Geographic Concentration Risk | Property Plant and Equipment
Segment Reporting Information [Line Items]
Concentration of risk, Percentage	100.00%	100.00%
Geographic Concentration Risk | United States | Property Plant and Equipment
Segment Reporting Information [Line Items]
Concentration of risk, Percentage	81.00%	76.00%
Geographic Concentration Risk | United Kingdom | Property Plant and Equipment
Segment Reporting Information [Line Items]
Concentration of risk, Percentage	9.00%	12.00%
Geographic Concentration Risk | Other countries | Property Plant and Equipment
Segment Reporting Information [Line Items]
Concentration of risk, Percentage	10.00%	12.00%

Segment Information - Revenue_3

Segment Information - Revenues and Percentage of Revenues on Customers Basis (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Revenue, Major Customer [Line Items]
Revenues	$ 279,791	$ 259,505	$ 257,858	$ 235,321	$ 253,205	$ 230,986	$ 228,378	$ 219,600	$ 1,032,475	$ 932,169	$ 881,356
Experian
Revenue, Major Customer [Line Items]
Revenues									109,638	80,347	65,753
TransUnion & Equifax customer
Revenue, Major Customer [Line Items]
Revenues									143,922	104,475	97,427
Other customers
Revenue, Major Customer [Line Items]
Revenues									$ 778,915	$ 747,347	$ 718,176
Sales Revenue | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Concentration of risk, Percentage									100.00%	100.00%	100.00%
Sales Revenue | Customer Concentration Risk | Experian
Revenue, Major Customer [Line Items]
Concentration of risk, Percentage									11.00%	9.00%	8.00%
Sales Revenue | Customer Concentration Risk | TransUnion & Equifax customer
Revenue, Major Customer [Line Items]
Concentration of risk, Percentage									14.00%	11.00%	11.00%
Sales Revenue | Customer Concentration Risk | Other customers
Revenue, Major Customer [Line Items]
Concentration of risk, Percentage									75.00%	80.00%	81.00%

Commitments - Minimum Future Co

Commitments - Minimum Future Commitments Under Non Cancelable Operating Leases and Other Obligations (Detail) $ in Thousands	Sep. 30, 2018USD ($)
Future Minimum Lease Commitments
2,018	$ 24,224
2,019	15,694
2,020	15,768
2,021	14,151
2,022	12,866
Thereafter	33,030
Total	$ 115,733

Commitments - Additional Inform

Commitments - Additional Information (Detail) $ in Millions	12 Months Ended
	Sep. 30, 2018USD ($)executive	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)
Commitments and Contingencies Disclosure [Abstract]
Rent expense under operating leases | $	$ 19.8	$ 18.6	$ 17.6
Number of executives in a management agreement providing for certain payments and other benefits in the event of a qualified change | executive	22

Guarantees - Additional Informa

Guarantees - Additional Information (Detail)	12 Months Ended
	Sep. 30, 2018
Maximum
Product Warranty [Line Items]
Duration of product warranties	90 days

Supplementary Financial Data _3

Supplementary Financial Data (Unaudited) - Selected Unaudited Consolidated Financial Results (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended																12 Months Ended
	Sep. 30, 2018		Jun. 30, 2018		Mar. 31, 2018		Dec. 31, 2017		Sep. 30, 2017		Jun. 30, 2017		Mar. 31, 2017		Dec. 31, 2016		Sep. 30, 2018		Sep. 30, 2017		Sep. 30, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 279,791		$ 259,505		$ 257,858		$ 235,321		$ 253,205		$ 230,986		$ 228,378		$ 219,600		$ 1,032,475		$ 932,169		$ 881,356
Cost of revenues	79,431	[1]	78,390	[1]	78,519	[1]	74,359	[1]	75,202	[1]	69,793	[1]	72,131	[1]	69,997	[1]	310,699	[2]	287,123	[2]	265,173	[2]
Gross profit	200,360		181,115		179,339		160,962		178,003		161,193		156,247		149,603
Net income	$ 50,480		$ 32,361		$ 32,275		$ 27,299		$ 40,044		$ 25,227		$ 25,084		$ 37,901		$ 142,415		$ 128,256		$ 109,448
Earnings per share:
Basic (in dollars per share)	$ 1.74	[3]	$ 1.09	[3]	$ 1.08	[3]	$ 0.91	[3]	$ 1.31	[3]	$ 0.82	[3]	$ 0.81	[3]	$ 1.22	[3]	$ 4.79		$ 4.16		$ 3.52
Diluted (in dollars per share)	$ 1.64	[3]	$ 1.04	[3]	$ 1.03	[3]	$ 0.86	[3]	$ 1.25	[3]	$ 0.78	[3]	$ 0.78	[3]	$ 1.16	[3]	$ 4.57		$ 3.98		$ 3.39
Shares used in computing earnings per share:
Basic weighted-average shares (in shares)	29,077		29,708		29,985		30,078		30,534		30,914		31,017		30,989		29,711		30,862		31,129
Diluted (in shares)	30,702		31,161		31,300		31,561		31,963		32,224		32,260		32,536		31,180		32,245		32,308
[1]	Cost of revenues excludes amortization expense of $0.5 million, $0.6 million, $0.6 million, $0.7 million, $1.4 million, $1.7 million, $1.7 million and $1.7 million for the quarters ended September 30, 2018, June 30, 2018, March 31, 2018, December 31, 2017, September 30, 2017, June 30, 2017, March 31, 2017 and December 31, 2016, respectively.
[2]	Cost of revenues and selling, general and administrative expenses exclude the amortization of intangible assets. See Note 7.
[3]	Earnings per share is computed independently for each of the quarters presented. Therefore, the sum of the quarterly per share amounts may not equal the totals for the respective years.

Supplementary Financial Data _4

Supplementary Financial Data (Unaudited) - Selected Unaudited Consolidated Financial Results - Additional Information (Detail) - USD ($) $ in Thousands

3 Months Ended

12 Months Ended

Sep. 30, 2018

Jun. 30, 2018

Mar. 31, 2018

Dec. 31, 2017

Sep. 30, 2017

Jun. 30, 2017

Mar. 31, 2017

Dec. 31, 2016

Sep. 30, 2018

Sep. 30, 2017

Sep. 30, 2016

Quarterly Financial Information Disclosure [Abstract]

Amortization expense

$ 500

$ 600

$ 600

$ 700

$ 1,400

$ 1,700

$ 1,700

$ 1,700

$ 6,594

[1]

$ 12,709

[1]

$ 13,982

[1]

[1]

Cost of revenues and selling, general and administrative expenses exclude the amortization of intangible assets. See Note 7.