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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, 2021 | Sep. 30, 2020 | Sep. 30, 2019
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 | $ 112.5 | $ 93.7 | $ 83.0
Tax benefit related to share-based compensation expense | 14.0 | $ 13.2 | $ 12.5
Unrecognized compensation cost related to non-vested share-based compensation arrangements | $ 151.0 |  |
Unrecognized compensation cost, weighted average recognition period | 2 years 3 months 7 days |  |
Cash received from stock option exercises | $ 4.4 |  |
Tax benefit from the stock option exercises | $ 3.7 |  |
Weighted average fair value of options granted (in dollars per share) | $ 139.11 | $ 99.30 | $ 59.63
Number of options that had exercise prices lower than the market price of common stock (in shares) | 200,000 |  |
Market price of common stock (in dollars per share) | $ 397.93 |  |
Total intrinsic value of options exercised | $ 15.8 | $ 132.6 | $ 99.1
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) | $ 505.70 | $ 356.66 | $ 206.29
Total intrinsic value of restricted stock units, performance stock units, and market stock units | $ 156.6 | $ 159.0 | $ 91.2
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) | $ 506.91 | $ 354.18 | $ 185.05
Total intrinsic value of restricted stock units, performance stock units, and market stock units | $ 34.7 | $ 36.5 | $ 19.3
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) | $ 471.16 | $ 249.13 | $ 169.46
Total intrinsic value of restricted stock units, performance stock units, and market stock units | $ 34.5 | $ 44.6 | $ 21.6
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 |  |
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% |  |
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% |  |
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) | 5,850,154 |  |
Employee Stock Purchase Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares available for grants under stock plan (in shares) | 907,300 |  |
Authorized shares of common stock for grant under stock plan (in shares) | 1,000,000 |  |
ESPP, percentage of salary withheld through payroll deductions to purchase FICO common stock | 15.00% |  |
ESPP, purchase price of the stock as a percentage of fair market value on the exercise date | 85.00% |  |
Employee stock purchase plans, offering period (in months) | 6 months |  |

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- Definition Share Based Compensation Arrangement By Share-based Payment Award, Options, Outstanding, Number, With Exercise Prices Lower Than Market Price + References No definition available. + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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