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Business Combinations - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
0 Months Ended
Jan. 12, 2015
Mar. 31, 2015
Sep. 30, 2014
Business Acquisition [Line Items]      
Goodwill   $ 809,117us-gaap_Goodwill $ 779,928us-gaap_Goodwill
TONBELLER      
Business Acquisition [Line Items]      
Common stock acquired (percent) 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= fico_TONBELLERMember
   
Number of customers (more than a thousand) 1,000fico_NumberOfCustomers
/ us-gaap_BusinessAcquisitionAxis
= fico_TONBELLERMember
   
Weighted average useful life 4 years 11 months    
Goodwill $ 46,188us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= fico_TONBELLERMember
   
Completed technology | TONBELLER      
Business Acquisition [Line Items]      
Weighted average useful life 5 years    
Customer relationships | TONBELLER      
Business Acquisition [Line Items]      
Weighted average useful life 5 years    
Trade names | TONBELLER      
Business Acquisition [Line Items]      
Weighted average useful life 3 years