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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, 2019
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Average expected dividend yield 0.00% 0.00% 0.07%
Market stock units (MSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility in FICO’s stock price 24.60% 24.60% 27.40%
Expected volatility in Russell 3000 Index 12.80% 12.70% 13.60%
Correlation between FICO and the Russell 3000 Index 66.60% 63.10% 59.80%
Risk-free interest rate 2.73% 1.92% 1.40%
Average expected dividend yield 0.00% 0.00% 0.07%