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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, 2018
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility in FICO’s stock price   35.30%  
Risk-free interest rate   2.02%  
Average expected dividend yield 0.00% 0.07% 0.09%
Market stock units (MSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility in FICO’s stock price 24.60% 27.40% 24.10%
Expected volatility in Russell 3000 Index 12.70% 13.60% 12.80%
Correlation between FICO and the Russell 3000 Index 63.10% 59.80% 60.20%
Risk-free interest rate 1.92% 1.40% 1.25%
Average expected dividend yield 0.00% 0.07% 0.09%