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Stock-Based Employee Benefit Plans - Assumptions Used to Estimate Fair Value of Market Stock Units (Details)
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Average expected dividend yield 0.09% 0.14% 0.16%
Market stock units (MSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility in FICO’s stock price 24.10% 26.60% 33.90%
Expected volatility in Russell 3000 Index 12.80% 12.20% 17.30%
Correlation between FICO and the Russell 3000 Index 60.20% 55.90% 68.00%
Risk-free interest rate 1.25% 1.10% 0.68%
Average expected dividend yield 0.09% 0.14% 0.16%