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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, 2017
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Average expected dividend yield 0.07% 0.09% 0.14%
Market stock units (MSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility in FICO’s stock price 27.40% 24.10% 26.60%
Expected volatility in Russell 3000 Index 13.60% 12.80% 12.20%
Correlation between FICO and the Russell 3000 Index 59.80% 60.20% 55.90%
Risk-free interest rate 1.40% 1.25% 1.10%
Average expected dividend yield 0.07% 0.09% 0.14%