Fed Funds Effective Rate Fed Funds Effective Rate Overnight Index Swap Rate [Member] Deferred Revenue Arrangement, by Type [Table] Deferred Revenue Arrangement, by Type [Table] Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term ESPP, percentage of salary withheld through payroll deductions to purchase FICO common stock Share-Based Compensation Arrangement by Share-Based Payment Award, Maximum Employee Subscription Rate Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Statistical Measurement [Domain] Statistical Measurement [Domain] Cover [Abstract] Cover [Abstract] Increase in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Summary of Outstanding Foreign Currency Forward Contracts Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Trading Symbol Trading Symbol Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] All Trading Arrangements All Trading Arrangements [Member] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Non-NEOs Non-NEOs [Member] Reconciliation of Numerators and Denominators of Basic and Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Award vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Derivative [Line Items] Derivative [Line Items] Cash paid for income taxes, net of refunds of $236 and $10 during the quarters ended December 31, 2024 and 2023, respectively Income Taxes Paid, Net Restricted stock units subject to market or performance conditions Restricted Stock Units Subject To Market or Performance Conditions [Member] Restricted Stock Units Subject To Market or Performance Conditions [Member] Position [Axis] Position [Axis] Pay vs Performance Disclosure [Line Items] Line of Credit Facility [Table] Line of Credit Facility [Table] Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Software Software [Member] Software Accounts receivable Increase (Decrease) in Accounts Receivable Derivative [Table] Derivative [Table] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Fair Value Measurements Fair Value Disclosures [Text Block] Interest rate of borrowings outstanding Line of Credit Facility, Interest Rate at Period End Foreign Exchange Contracts To Purchase Currencies Domain Foreign Exchange Contracts To Purchase Currencies [Domain] Foreign Exchange Contracts To Purchase Currencies Domain Award Timing Disclosures [Line Items] Scores Scores [Member] Scores [Member] Other Performance Measure, Amount Other Performance Measure, Amount Contingencies Legal Matters and Contingencies [Text Block] Goodwill [Line Items] Goodwill [Line Items] Common stock, shares outstanding Common Stock, Shares, Outstanding Proceeds from sales of marketable securities Proceeds from Sale and Maturity of Marketable Securities Operating lease liabilities Operating Lease, Liability, Noncurrent May 2018 Senior Notes Senior Notes May Twenty Eighteen [Member] Senior Notes May Twenty Eighteen [Member] Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Deferred revenue, current portion Contract with Customer, Liability, Current Plan Name [Domain] Plan Name [Domain] Loans Payable Loans Payable [Member] Effect of dilutive securities (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment Other assets Other Assets, Noncurrent Entity Tax Identification Number Entity Tax Identification Number Repurchases of common stock (in shares) Treasury Stock, Shares, Acquired Operating Segments Operating Segments [Member] Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Treasury Stock Treasury Stock, Common [Member] Summary of Performance Share Unit Activity Share-Based Payment Arrangement, Performance Shares, Outstanding Activity [Table Text Block] Plan Name [Axis] Plan Name [Axis] Equity Components [Axis] Equity Components [Axis] Award Timing Method Award Timing Method [Text Block] Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Exercisable at December 31, 2024 (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price Measurement Frequency [Axis] Measurement Frequency [Axis] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Contract amount of forward foreign currency contracts Derivative Asset, Notional Amount Insider Trading Policies and Procedures [Line Items] Numerator for diluted and basic earnings per share: Earnings Per Share Basic And Diluted Numerator [Abstract] Earnings Per Share Basic And Diluted Numerator [Abstract] Loans Payable to Bank Loans Payable to Bank Use of Estimates Use of Estimates, Policy [Policy Text Block] Total operating expenses Segment operating expense Costs and Expenses Weighted- average Grant-date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Weighted Average Grant Date Fair Value [Roll Forward] Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Weighted Average Grant Date Fair Value [Roll Forward] Senior Notes December 2021 Senior Notes December 2021 [Member] Senior Notes December 2021 Adjustment to Compensation, Amount Adjustment to Compensation Amount Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value TransUnion, Equifax and Experian customers TransUnion, Equifax and Experian customers [Member] TransUnion, Equifax and Experian customers Additional paid-in-capital Additional Paid in Capital, Common Stock Compensation Amount Outstanding Recovery Compensation Amount Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Entity Small Business Entity Small Business Company Selected Measure Amount Company Selected Measure Amount Geographical [Axis] Geographical [Axis] Tabular List, Table Tabular List [Table Text Block] Initial Term Loan to Bank Initial Term Loan to Bank Initial Term Loan to Bank Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] EMEA EMEA [Member] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Other accrued liabilities Accrued Liabilities, Current Credit Facility [Domain] Credit Facility [Domain] Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Current assets: Assets, Current [Abstract] Fair value of forward foreign currency contracts to sell and buy foreign currency Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value Goodwill Balance at September 30, 2024 Balance at December 31, 2024 Goodwill Less: allowance for doubtful accounts Accounts Receivable, Allowance for Credit Loss Consolidation Items [Axis] Consolidation Items [Axis] Taxes paid related to net share settlement of equity awards Payment, Tax Withholding, Share-Based Payment Arrangement Proceeds from Income Tax Refunds Proceeds from Income Tax Refunds Treasury stock, shares Treasury Stock, Common, Shares Unrecognized tax benefits, accrued interest Unrecognized Tax Benefits, Interest on Income Taxes Accrued Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Product and Service [Domain] Product and Service [Domain] Employee stock option Share-Based Payment Arrangement, Option [Member] Foreign currency forward contracts Foreign Exchange Forward [Member] Depreciation expense Depreciation Released (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Goodwill [Roll Forward] Goodwill [Roll Forward] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Forward foreign currency contracts fair value Derivative, Fair Value, Net Payments on finance leases Proceeds from (Payments for) Other Financing Activities Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Employee Stock Purchase Plan Employee Stock Purchase Plan [Member] Employee Stock Purchase Plan [Member] Loans Payable to Bank, Current Loans Payable to Bank, Current The $450 Million Term Loan The $450 Million Term Loan [Member] The $450 Million Term Loan Preferred stock, shares outstanding Preferred Stock, Shares Outstanding Payments on revolving line of credit and term loans Repayments of Lines of Credit Security Exchange Name Security Exchange Name Debt instrument basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Award Type [Axis] Award Type [Axis] Earnings per share: Earnings Per Share, Basic [Abstract] Foreign currency translation adjustment Goodwill, Foreign Currency Translation Gain (Loss) Exercised (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Property and equipment, net Property, Plant and Equipment, Net Total liabilities Liabilities Common stock, par value (in usd per share) Common Stock, Par or Stated Value Per Share Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Research and development Research and Development Expense Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Revolving Credit Facility Revolving Credit Facility [Member] Expiration Date Trading Arrangement Expiration Date Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] Concentration Risk, Receivables, Number of Customers Concentration Risk, Receivable, Number of Customers Concentration Risk, Receivable, Number of Customers Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Total Shareholder Return Amount Total Shareholder Return Amount Common stock, shares issued Common Stock, Shares, Issued Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Concentration Risk, Percentage Concentration Risk, Percentage Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Less: accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Cash deposits Cash Property and equipment Property, Plant and Equipment, Gross Exercised (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Accounts Receivable, after Allowance for Credit Loss Accounts Receivable, after Allowance for Credit Loss Debt Instrument [Line Items] Debt Instrument [Line Items] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Weighted-average Exercise Price Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Common stock, shares authorized Common Stock, Shares Authorized Principles of Consolidation and Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Diluted (in shares) Diluted weighted-average shares (in shares) Weighted Average Number of Shares Outstanding, Diluted MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] The $300 Million Term Loan The $300 Million Term Loan [Member] The $300 Million Term Loan Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Total stockholders’ deficit Beginning Balance Ending Balance Equity, Attributable to Parent Treasury stock, at cost (64,414 and 64,465 shares at December 31, 2024 and September 30, 2024, respectively) Treasury Stock, Value Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Hedging Designation [Domain] Hedging Designation [Domain] Deferred income taxes Deferred Income Tax Expense (Benefit) SaaS Products SaaS Products [Member] SaaS (Software as a service) Products Schedule of Goodwill Schedule of Goodwill [Table Text Block] Internal-use software Software and Software Development Costs [Member] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Selling, general and administrative Selling, General and Administrative Expense Current maturities on debt Debt, Current Fair Value, Measurements, Recurring Fair Value, Recurring [Member] Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current William Lansing [Member] William Lansing Authorized shares of common stock for grant under stock plan (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Other liabilities Increase (Decrease) in Other Operating Liabilities Long-term debt Long-Term Debt Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Document Fiscal Period Focus Document Fiscal Period Focus All Executive Categories All Executive Categories [Member] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Assets Assets [Abstract] Document Type Document Type Derivative Contract [Domain] Derivative Contract [Domain] Gains (losses) on foreign currency forward contracts Gain (Loss) on Derivative Instruments, Net, Pretax Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Summary of Segment Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Purchases of marketable securities Payments to Acquire Marketable Securities Less: long-term receivables Accounts Receivable, after Allowance for Credit Loss, Noncurrent Released (in shares) Released (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period SOFR Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Maximum Maximum [Member] Amortization of intangible assets Unallocated amortization expense Amortization of Intangible Assets Preferred stock ($0.01 par value; 1,000 shares authorized; none issued and outstanding) Preferred Stock, Value, Outstanding Contract with Customer, Liability Contract with Customer, Liability Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Goodwill, Impaired, Accumulated Impairment Loss Goodwill, Impaired, Accumulated Impairment Loss Nature of Business Business Description and Accounting Policies [Text Block] Accounts payable Accounts Payable, Current Accounting Policies [Abstract] Accounting Policies [Abstract] Credit facility restrictive covenant, maximum consolidated leverage ratio step up Leverage Ratios, Step Up, Maximum Leverage Ratios, Step Up, Maximum Current Fiscal Year End Date Current Fiscal Year End Date ESPP, purchase price of the stock as a percentage of fair market value on the exercise date Share-Based Compensation Arrangement by Share-Based Payment Award, Discount from Market Price, Purchase Date Statistical Measurement [Axis] Statistical Measurement [Axis] PEO Name PEO Name Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Shares Issued during the period Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Award Type [Domain] Award Type [Domain] Name Outstanding Recovery, Individual Name Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Issuance of treasury stock under employee stock plans (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] On-Premises On-Premises Products [Member] On-Premises Products[Member] Transferred over Time Transferred over Time [Member] Deferred income tax Deferred Income Tax Assets, Net Non-PEO NEO Non-PEO NEO [Member] Senior Notes, Noncurrent Senior Notes, Noncurrent Revolving credit facility, expiration date Line of Credit Facility, Expiration Date Additional Paid-in Capital Additional Paid-in Capital [Member] Schedule of Accounts Receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Award Timing Predetermined Award Timing Predetermined [Flag] Goodwill Disclosure Goodwill Disclosure [Text Block] Unbilled Unbilled Receivables, Current New Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Diluted (in dollars per share) Earnings Per Share, Diluted Non-cash operating lease costs Operating Lease, Right-of-Use Asset, Periodic Reduction Name Measure Name Entity Interactive Data Current Entity Interactive Data Current Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Contract With Customer, Payment Term Contract With Customer, Payment Term Contract With Customer, Payment Term Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term Preferred stock, shares issued Preferred Stock, Shares Issued Customer [Axis] Customer [Axis] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Business to business Scores Business to business Scores [Member] Business to business Scores Share-based compensation Unallocated share-based compensation expense Share-Based Payment Arrangement, Noncash Expense Income tax provision (benefit) Income Tax Expense (Benefit) Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Unallocated Corporate Expenses Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Supplemental disclosures of cash flow information: Supplemental Cash Flow Information [Abstract] Total revenues Revenue from Contract with Customer, Excluding Assessed Tax Gains (Losses) on Derivative Financial Instruments Derivative Instruments, Gain (Loss) [Table Text Block] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Operating income Operating Income (Loss) Interest expense, net Unallocated interest expense Interest Expense, Operating and Nonoperating Variable Rate [Domain] Variable Rate [Domain] Number of reportable segments Number of Reportable Segments Total liabilities and stockholders’ deficit Liabilities and Equity Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] All Adjustments to Compensation All Adjustments to Compensation [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Accrued compensation and employee benefits Employee-related Liabilities, Current Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Hedging Designation [Axis] Hedging Designation [Axis] Marketable securities Marketable Securities, Noncurrent Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Contract with Customer, Payment Term [Line Items] Contract with Customer, Payment Term [Line Items] Contract with Customer, Payment Term Individual: Individual [Axis] Common stock ($0.01 par value; 200,000 shares authorized, 88,857 shares issued and 24,443 and 24,392 shares outstanding at December 31, 2024 and September 30, 2024, respectively) Common Stock, Value, Outstanding Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Revenue, remaining performance obligation, expected timing of satisfaction, period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Product and Service [Axis] Product and Service [Axis] Entity Address, State or Province Entity Address, State or Province Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Statement [Line Items] Statement [Line Items] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Summary of Property and Equipment and Other Accrued Liabilities Property, Plant and Equipment [Table Text Block] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Outstanding at September 30, 2024 (in dollars per share) Outstanding at December 31, 2024 (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Liabilities and Stockholders’ Deficit Liabilities and Equity [Abstract] Asia Pacific Asia Pacific [Member] Minimum Minimum [Member] Restatement Determination Date Restatement Determination Date Vested and expected to vest at December 31, 2024 (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Adoption Date Trading Arrangement Adoption Date Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Deferred revenue, noncurrent Contract with Customer, Liability, Noncurrent Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Outstanding at September 30, 2024 (in dollars per share) Outstanding at December 31, 2024 (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price On-premises and SaaS software On-premises and SaaS software [Member] On-premises and SaaS software Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Outstanding at September 30, 2024 (in shares) Outstanding at December 31, 2024 (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Provision for doubtful accounts Accounts Receivable, Credit Loss Expense (Reversal) Segments [Axis] Segments [Axis] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Exercise Price Award Exercise Price Earnings per Share Earnings Per Share [Text Block] Accrued compensation and employee benefits Increase (Decrease) in Employee Related Liabilities Arrangement Duration Trading Arrangement Duration Operating expenses: Costs and Expenses [Abstract] Stockholders’ deficit: Equity, Attributable to Parent [Abstract] Granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Foreign Exchange Contracts To Purchase Singapore Dollars With US Dollars Foreign Exchange Contracts To Purchase Singapore Dollars With United States Dollars [Member] [Domain] Foreign Exchange Contracts To Purchase Singapore Dollars With United States Dollars [Member] [Domain] Segments [Domain] Segments [Domain] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] All Individuals All Individuals [Member] Proceeds from revolving line of credit and term loans Proceeds from Lines of Credit PEO PEO [Member] Variable Rate [Axis] Variable Rate [Axis] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Name Trading Arrangement, Individual Name Other income, net Unallocated other income, net Other Nonoperating Income (Expense) Non-platform software Non-platform software [Member] Non-platform software Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Proceeds from issuance of treasury stock under employee stock plans Proceeds, Issuance of Shares, Share-Based Payment Arrangement, Including Option Exercised Foreign Exchange Contracts To Sell European Euro for US Dollar Foreign Exchange Contracts To Sell European Euro For United States Dollar [Member] Foreign Exchange Contracts To Sell European Euro For U S dollar [Member] Payments to Develop Software Payments to Develop Software Foreign Exchange Contracts To Purchase British Pounds With US Dollars Foreign Exchange Contracts To Purchase British Pounds With United States Dollars [Member] Foreign Exchange Contracts To Purchase British Pounds With US Dollars [Member] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Assets: Assets, Fair Value Disclosure [Abstract] Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Beginning Balance (in shares) Ending Balance (in shares) Shares, Outstanding Cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Local Phone Number Local Phone Number Aggregate Intrinsic Value Share Based Compensation Arrangement By Share Based Payment Award Options Aggregate Intrinsic Value [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Aggregate Intrinsic Value [Abstract] Concentration Risk, Revenue, Number of Customers Concentration Risk, Revenue, Number of Customers Concentration Risk, Revenue, Number of Customers Debt, Long-Term and Short-Term, Combined Amount Debt, Long-Term and Short-Term, Combined Amount Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Professional services Technology Service [Member] Americas Americas [Member] Summary of Restricted Stock Unit Activity Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] Short-term forward contracts, average maturities at inception (less than) Maximum Remaining Maturity of Foreign Currency Derivatives Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] PEO Total Compensation Amount PEO Total Compensation Amount Carrying value of Senior Notes Senior Notes Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] Interest payable Interest Payable, Current Vested and expected to vest at December 31, 2024 (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Debt Disclosure [Abstract] Debt Disclosure [Abstract] Common Stock Common Stock [Member] Measure: Measure [Axis] Unsettled repurchases of common stock Noncash Unsettled Repurchase Of Common Stock Noncash Unsettled Repurchase Of Common Stock Issuance of treasury stock under employee stock plans Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Preferred stock, shares authorized Preferred Stock, Shares Authorized Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Line of Credit Line of Credit [Member] Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures Emerging Growth Company Entity Emerging Growth Company Deferred Revenue, by Arrangement, Disclosure Deferred Revenue, by Arrangement, Disclosure [Table Text Block] Segment Reporting [Abstract] Segment Reporting [Abstract] Entity Central Index Key Entity Central Index Key Debt instrument, maturity date Debt Instrument, Maturity Date Short Short [Member] Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Equity Component [Domain] Equity Component [Domain] Preferred stock, par value (in usd per share) Preferred Stock, Par or Stated Value Per Share Segment Information Segment Reporting Disclosure [Text Block] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Share-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Entity Shell Company Entity Shell Company Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Title Trading Arrangement, Individual Title Statement [Table] Statement [Table] Measurement Frequency [Domain] Measurement Frequency [Domain] Unrecognized tax benefits, uncertain tax positions Unrecognized Tax Benefits Geographic Concentration Risk Geographic Concentration Risk [Member] Consolidation Items [Domain] Consolidation Items [Domain] Position [Domain] Position [Domain] City Area Code City Area Code Current liabilities: Liabilities, Current [Abstract] Number of Countries in which Entity Operates Number of Countries in which Entity Operates Segment revenues: Segment Reporting Information, Revenue for Reportable Segment [Abstract] Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Active Markets for Identical Instruments (Level 1) Fair Value, Inputs, Level 1 [Member] Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Total current assets Assets, Current Billed Accounts Receivable, before Allowance for Credit Loss Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Senior Notes Senior Notes [Member] Supplemental disclosures of non-cash investing and financing activities: Noncash Investing and Financing Items [Abstract] Market Share Units Market Stock Units (MSUs) [Member] Market Stock Units (MSUs) [Member] Repurchases of common stock Payments for Repurchase of Common Stock Options, Exercisable at December 31, 2024, in Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Summary of Market Share Unit Activity Share-Based Compensation, Market Stock Units Award Outstanding [Table Text Block] Share-Based Compensation, Market Stock Units Award Outstanding [Table Text Block] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Long-Term Debt, Excluding Current Maturities Long-Term Debt, Excluding Current Maturities Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] 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] Revenue, Remaining Performance Obligation, Percentage Revenue, Remaining Performance Obligation, Percentage Senior Notes December 2019 Senior Notes December Six 2019 [Member] Senior Notes December Six 2019 Income Taxes Income Tax Disclosure [Text Block] Earnings per share: Earnings Per Share [Abstract] Retained earnings Retained Earnings (Accumulated Deficit) Revenue from Contract with Customer Benchmark [Member] Revenue from Contract with Customer Benchmark [Member] Schedule of Debt Schedule of Debt [Table Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Equity Awards Adjustments Equity Awards Adjustments [Member] Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Underlying Securities Award Underlying Securities Amount Performance Share Units Performance Shares [Member] Deferred revenue Deferred Revenue, Current Credit Facility [Axis] Credit Facility [Axis] Amendment Flag Amendment Flag Long-Term Debt, Fair Value Long-Term Debt, Fair Value Entity Registrant Name Entity Registrant Name Net (gain) loss on sales and abandonment of property and equipment Gain (Loss) on Disposition of Property Plant Equipment Transferred at Point in Time Transferred at Point in Time [Member] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Depreciation and amortization Depreciation, Depletion and Amortization Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Axis] Dec 2019 and 2021 Senior Notes Senior Notes 2019 and 2021 [Member] Senior Notes 2019 and 2021 Property and equipment Machinery and Equipment [Member] Fair Value as of Grant Date Award Grant Date Fair Value Customer Concentration Risk Customer Concentration Risk [Member] Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Debt issuance costs Debt Issuance Costs, Net Debt Disclosure Debt Disclosure [Text Block] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Geographical [Domain] Geographical [Domain] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Senior Notes issued in a private placement to a group of institutional investors Debt Instrument, Face Amount Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date: Restatement Determination Date [Axis] Title of 12(b) Security Title of 12(b) Security Restricted stock units not subject to market or performance conditions Restricted Stock Units Not Subject To Market or Performance Conditions [Member] Restricted Stock Units Not Subject To Market or Performance Conditions [Member] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Interest coverage ratio Interest coverage ratio Interest coverage ratio Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value Forfeited (in dollars per share) Forfeited (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Platform software Platform software [Member] Platform software Line of Credit Facility, Periodic Payment Line of Credit Facility, Periodic Payment Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Line of Credit, Noncurrent Long-Term Line of Credit, Noncurrent Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Basic (in dollars per share) Earnings Per Share, Basic Accounts payable Increase (Decrease) in Accounts Payable Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Stock option awards term Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period Property and equipment, net Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Purchase of property and equipment included in accounts payable Capital Expenditures Incurred but Not yet Paid Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Goodwill [Table] Goodwill [Table] Increases due to billings, excluding amounts recognized as revenue during the period Contract With Customer, Liability, Excluding Revenue Recognized Deferred Revenue Increased from Customer Contracts due to cash received Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Total current liabilities Liabilities, Current Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Denominator — share: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Total assets Assets Borrowings outstanding Long-Term Line of Credit Granted (in shares) Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Financial Assets Measured on a Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Other liabilities Other Liabilities, Noncurrent Weighted-average Remaining Contractual Term Share Based Compensation Arrangement By Share Based Payment Award Options Weighted Average Remaining Contractual Term [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Term [Abstract] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Commitments and contingencies Commitments and Contingencies Termination Date Trading Arrangement Termination Date Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Stock-Based Employee Benefit Plans Share-Based Payment Arrangement [Text Block] Credit facility restrictive covenant, maximum consolidated leverage ratio Leverage Ratios Maximum Leverage Ratios Maximum Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Entity Address, City or Town Entity Address, City or Town Debt Instrument [Axis] Debt Instrument [Axis] Summary of Option Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Schedule of Carrying Values and Estimated Fair Values of Debt Instruments Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] Net income Net income Net Income (Loss) Attributable to Parent Trading Arrangement: Trading Arrangement [Axis] Granted (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Unsecured revolving line of credit Line of Credit Facility, Current Borrowing Capacity Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Entity File Number Entity File Number Revenue from Contract with Customer Revenue from Contract with Customer [Text Block] Document Fiscal Year Focus Document Fiscal Year Focus Income Statement [Abstract] Income Statement [Abstract] Entity Address, Address Line One Entity Address, Address Line One Product Concentration Risk Product Concentration Risk [Member] Other comprehensive income (loss): Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract] Repurchases of common stock Treasury Stock, Value, Acquired, Cost Method Shares used in computing earnings per share: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Effect of exchange rate changes on cash Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations Other Accrued Liabilities, Current Other Accrued Liabilities, Current Total Assets, Fair Value Disclosure Name Forgone Recovery, Individual Name Document Period End Date Document Period End Date Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Base Rate Base Rate [Member] Outstanding at September 30, 2024 (in shares) Outstanding at December 31, 2024 (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Deferred revenue Increase (Decrease) in Deferred Revenue Insider Trading Arrangements [Line Items] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Composition of Certain Financial Statement Captions Supplemental Balance Sheet Disclosures [Text Block] Timing of Transfer of Good or Service [Domain] Timing of Transfer of Good or Service [Domain] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Business to consumer Scores Business to consumer Scores [Member] Business to consumer Scores Cost of revenues Cost of Revenue Fair Isaac Corporation Nature Of Operations Policy [Policy Text Block] Nature of Operations, Policy [Policy Text Block] Revenue recognized that was included in the deferred revenues balance at the beginning of the period Contract with Customer, Liability, Revenue Recognized Adjustment to Compensation: Adjustment to Compensation [Axis] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Accounts Receivable Accounts Receivable [Member] Document Transition Report Document Transition Report Document Quarterly Report Document Quarterly Report Customer [Domain] Customer [Domain] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Current Reporting Status Entity Current Reporting Status Retained Earnings Retained Earnings [Member] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Basic (in shares) Basic weighted-average shares (in shares) Weighted Average Number of Shares Outstanding, Basic Scores Scores Products [Member] Scores Products [Member] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Net (gain) loss on marketable securities Marketable Security, Gain (Loss) Receivables Gross Receivables Gross Receivables, Gross Loans Payable to Bank, Noncurrent Loans Payable to Bank, Noncurrent Restricted Stock Units Restricted Stock Units (RSUs) [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Foreign Exchange Contracts To Purchase Currencies Axis Foreign Exchange Contracts To Purchase Currencies [Axis] Foreign Exchange Contracts To Purchase Currencies Axis Executive Category: Executive Category [Axis] Name Awards Close in Time to MNPI Disclosures, Individual Name Entity Filer Category Entity Filer Category Revenue, remaining performance obligation, amount Revenue, Remaining Performance Obligation, Amount Company Selected Measure Name Company Selected Measure Name