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Stock-Based Employee Benefit Plans - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
ESPP, purchase price of the stock as a percentage of fair market value on the exercise date | 15.00% |  |
Share-based compensation expense | $ 156.7 | $ 149.4 | $ 123.8
Tax benefit related to share-based compensation expense | 15.3 | $ 15.9 | $ 13.8
Unrecognized compensation cost related to non-vested share-based compensation arrangements | $ 199.9 |  |
Unrecognized compensation cost, weighted average recognition period | 2 years 3 months 10 days |  |
Cash received from stock option exercises | $ 14.7 |  |
Tax benefit from the stock option exercises | $ 5.2 |  |
Weighted average fair value of options granted (in dollars per share) | $ 705.43 | $ 419.00 | $ 289.54
Number of options that had exercise prices lower than the market price of common stock (in shares) | 124,000 |  |
Market price of common stock (in dollars per share) | $ 1,496.53 |  |
Total intrinsic value of options exercised | $ 107.6 | $ 49.1 | $ 16.7
Share-based Payment Arrangement, Option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock option awards vesting period | 4 years |  |
Restricted Stock Units Subject To Market or Performance Conditions |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock option awards vesting period | 3 years |  |
Restricted stock units and non-vested shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average fair value of restricted stock units, performance stock units, and market stock units (in dollars per share) | $ 2,119.14 | $ 1,150.58 | $ 620.51
Total intrinsic value of restricted stock units, performance stock units, and market stock units | $ 274.7 | $ 171.0 | $ 101.1
Performance stock units (PSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average fair value of restricted stock units, performance stock units, and market stock units (in dollars per share) | $ 2,227.11 | $ 1,134.39 | $ 615.45
Total intrinsic value of restricted stock units, performance stock units, and market stock units | $ 101.1 | $ 65.2 | $ 40.3
Market stock units (MSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average fair value of restricted stock units, performance stock units, and market stock units (in dollars per share) | $ 1,596.7 | $ 1,014.75 | $ 822.96
Total intrinsic value of restricted stock units, performance stock units, and market stock units | $ 102.1 | $ 95.0 | $ 42.2
Average expected dividend yield | 0.00% | 0.00% | 0.00%
Market stock units (MSUs) | Performance period year one |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance period | 1 year |  |
Market stock units (MSUs) | Performance period year two |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance period | 2 years |  |
Market stock units (MSUs) | Performance period year three |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance period | 3 years |  |
Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock option awards vesting period | 3 years |  |
Minimum | Performance stock units (PSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance condition payout (percent) | 0.00% |  |
Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock option awards vesting period | 4 years |  |
Maximum | Share-based Payment Arrangement, Option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock option awards term | 10 years |  |
Maximum | Performance stock units (PSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance condition payout (percent) | 200.00% |  |
Long-Term Incentive Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Authorized shares of common stock for grant under stock plan (in shares) | 5,900,000 |  |
2012 Long-Term Incentive Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares available for grants under stock plan (in shares) | 4,309,793 |  |
Employee Stock Purchase Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Authorized shares of common stock for grant under stock plan (in shares) | 1,000,000 |  |
Shares available for grants under stock plan (in shares) | 826,719 |  |
ESPP, percentage of salary withheld through payroll deductions to purchase FICO common stock | 15.00% |  |
Share-based compensation arrangement by share-based payment award, offering period | 6 months |  |
ESPP, purchase price of the stock as a percentage of fair market value on the exercise date | 85.00% |  |

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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