v2.4.0.8
Document and Entity Information
9 Months Ended
Jun. 30, 2015
Jul. 17, 2015
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2015  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q3  
Trading Symbol FICO  
Entity Registrant Name FAIR ISAAC CORP  
Entity Central Index Key 0000814547  
Current Fiscal Year End Date --09-30  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   31,137,873