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Share-Based Compensation (Tables) | 12 Months Ended
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Sep. 30, 2025
Share-Based Payment Arrangement [Abstract] |
Schedule of Fair Value Estimated at Grant Date Based on Black-Scholes-Merton Option-Pricing Model Using Weighted-Average Assumptions | Fair value is estimated at the grant date based on a Black-Scholes-Merton option-pricing model using the following weighted-average assumptions:
| Fiscal Year Ended September 30,
| 2025 |  | 2024 |  | 2023
Expected stock price volatility | 36 | % |  | 38 | % |  | 42 | %
Expected dividend yield | — | % |  | — | % |  | — | %
Risk free interest rate | 2.68 | % |  | 2.21 | % |  | 1.60 | %
Average expected life (in years) | 4.91 |  | 6.32 |  | 4.25
Schedule of Stock Option Activity | The following is a summary of stock option activity for the year ended September 30, 2025:
| Number of Options Outstanding |  | Weighted Average Exercise Price |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Term (in years) |  | Aggregate Intrinsic Value ($ millions)
Balances as of September 30, 2024 | 4,591,552 |  |  | $ | 34.42 |  |  | $ | 12.86 |  |  | 5.06 |  | $ | 88.7 |
Granted | 533,127 |  |  | $ | 77.18 |  |  | $ | 27.93 |  |  |  |  |
Exercised | (407,084) |  |  | $ | 26.26 |  |  | $ | 8.43 |  |  |  |  |
Forfeited | (55,993) |  |  | $ | 39.62 |  |  | $ | 13.39 |  |  |  |  |
Expired | (851) |  |  | $ | 27.60 |  |  | $ | 10.84 |  |  |  |  |
Balances as of September 30, 2025 | 4,660,751 |  |  | $ | 39.97 |  |  | $ | 14.96 |  |  | 4.47 |  | $ | 284.1 |
Exercisable at September 30, 2025 | 1,234,595 |  |  | $ | 23.47 |  |  | $ | 6.83 |  |  | 1.79 |  | $ | 95.6 |
Schedule of Options Outstanding Broken Down by Exercise Price | The options outstanding as of September 30, 2025 broken down by exercise price are as follows:
Exercise Price |  | Number of Options Outstanding |  | Weighted Average Exercise Price |  | Weighted Average Remaining Term (in Years)
$ | 15.00 |  | - | $ | 20.00 |  |  | 1,080,000 |  |  | $ | 20.00 |  |  | 1.18
$ | 25.00 |  | - | $ | 30.00 |  |  | 517,508 |  |  | $ | 26.79 |  |  | 2.82
$ | 40.00 |  | - | $ | 45.00 |  |  | 2,155,294 |  |  | $ | 42.77 |  |  | 6.01
$ | 45.00 |  | - | $ | 50.00 |  |  | 386,670 |  |  | $ | 47.26 |  |  | 5.36
$ | 50.00 |  | - | $ | 85.00 |  |  | 521,279 |  |  | $ | 77.41 |  |  | 5.92
|  |  |  | 4,660,751 |  |  | $ | 39.97 |  |  | 4.47
Schedule of Restricted Stock Units Activity | The following is a summary of restricted stock activity through September 30, 2025:
| Number of Shares Outstanding |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Term (in years) |  | Aggregate Intrinsic Value ($ millions)
Balances as of September 30, 2024 | 1,507,715 |  |  | $ | 41.42 |  |  | 1.13 |  | $ | 81.0 |
Granted | 749,809 |  |  | $ | 74.65 |  |  |  |  |
Vested | (748,398) |  |  | $ | 40.02 |  |  |  |  |
Forfeited | (1,327) |  |  | $ | 47.68 |  |  |  |  |
Balances as of September 30, 2025 | 1,507,799 |  |  | $ | 58.64 |  |  | 1.24 |  | $ | 152.2 |
Schedule of Performance Shares, Activity | The following is a summary of performance share activity through September 30, 2025:
| Number of Shares Outstanding |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Term (in years) |  | Aggregate Intrinsic Value ($ millions)
Balances as of September 30, 2024 | — |  |  | n/a |  | n/a |  | n/a
Granted | 225,000 |  |  | $ | 76.12 |  |  |  |  |
Balances as of September 30, 2025 | 225,000 |  |  | $ | 76.12 |  |  | 3.50 |  | $ | 22.7 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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