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Cover - USD ($)
 12 Months Ended
Sep. 30, 2025
Oct. 23, 2025
Mar. 31, 2025
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Sep. 30, 2025    
Current Fiscal Year End Date --09-30    
Document Transition Report false    
Entity File Number 1-11689    
Entity Registrant Name Fair Isaac Corp    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 94-1499887    
Entity Address, Address Line One 5 West Mendenhall, Suite 105    
Entity Address, City or Town Bozeman,    
Entity Address, State or Province MT    
Entity Address, Postal Zip Code 59715    
City Area Code 406    
Local Phone Number -7276    
Title of 12(b) Security Common Stock, $0.01 par value per share    
Trading Symbol FICO    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 36,060,682,209
Entity Common Stock, Shares Outstanding   23,709,047  
Documents Incorporated by Reference
Portions of the Registrant’s definitive proxy statement relating to its 2026 Annual Meeting of Stockholders (“2026 Proxy Statement”) are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated. The 2026 Proxy Statement will be filed with the U.S. Securities and Exchange Commission within 120 days after the end of the fiscal year to which this report relates.
    
Amendment Flag false    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000814547