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Revenue Disaggregation of Revenue [Table Text Block] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Other comprehensive income (loss): Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract] 2023 (excluding the quarter ended December 31, 2022) Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Senior Notes 2019 Senior Notes 2019 [Member] Senior Notes 2019 Property and equipment Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization Customer Contracts Customer-Related Intangible Assets [Member] Increase (decrease) in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Effect of dilutive securities (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment Entity Central Index Key Entity Central Index Key Estimated future intangible asset amortization expense Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Measurement Frequency [Axis] Measurement Frequency [Axis] Weighted-average Grant-date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Business to consumer Scores Business to consumer Scores [Member] Business to consumer Scores Revolving credit facility, expiration date Line of Credit Facility, Expiration Date Other Accrued Liabilities, Current Other Accrued Liabilities, Current Fair Isaac Corporation Nature Of Operations Policy [Policy Text Block] Nature of Operations, Policy [Policy Text Block] Federal Fund Rate Federal Fund Rate [Member] Federal Fund Rate [Member] City Area Code City Area Code Assets Assets [Abstract] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Revenue, Remaining Performance Obligation, Percentage Revenue, Remaining Performance Obligation, Percentage Nature of Business Business Description and Accounting Policies [Text Block] Share-based compensation Unallocated share-based compensation expense Share-Based Payment Arrangement, Noncash Expense Scores Scores Products [Member] Scores Products [Member] Variable Rate [Axis] Variable Rate [Axis] Other liabilities Other Liabilities, Noncurrent Receivables Gross Receivables Gross Receivables, Gross Other liabilities Increase (Decrease) in Other Operating Liabilities Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Foreign Exchange Contracts To Purchase Currencies Axis Foreign Exchange Contracts To Purchase Currencies [Axis] Foreign Exchange Contracts To Purchase Currencies Axis 2024 Finite-Lived Intangible Asset, Expected Amortization, Year One Reconciliation of Numerators and Denominators of Basic and Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Interest rate of borrowings outstanding Line of Credit Facility, Interest Rate at Period End Customer [Domain] Customer [Domain]