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Equity (Tables) | 12 Months Ended
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Sep. 30, 2025
Share-Based Payment Arrangement [Abstract] |
Schedule of Unvested Restricted Stock Units and Performance Share Units | The following table summarizes the activity for the Company’s unvested RSUs (inclusive of DSUs), PSUs, and stock options:
| Restricted Stock Units |  | Performance Share Units |  | Stock Options
| Number of Share Units |  | Weighted-Average Grant Date Fair Value |  | Number of Share Units |  | Weighted-Average Grant Date Fair Value |  | Number of Share Units |  | Weighted-Average Exercise Price
Unvested and outstanding balance as of September 30, 2024 | 4,126,605 |  |  | $ | 36.84 |  |  | 565,579 |  |  | $ | 51.04 |  |  | — |  |  | — |
Granted | 2,236,097 |  |  | 30.73 |  |  | — |  |  | — |  |  | 471,698 |  |  | 27.48 |
Vested | 1,442,026 |  |  | 34.74 |  |  | — |  |  | — |  |  | — |  |  | — |
Forfeited/canceled | 23,978 |  |  | 32.79 |  |  | — |  |  | — |  |  | — |  |  | — |
Unvested and outstanding balance as of September 30, 2025 | 4,896,698 |  |  | $ | 34.70 |  |  | 565,579 |  |  | $ | 51.04 |  |  | 471,698 |  |  | $ | 27.48 |
Schedule of Share Repurchased Under Share Repurchase Program | The following table summarizes our total share repurchases and retirement under the Share Repurchase Program during the fiscal year ended September 30, 2025.
|  | September 30, 2025
Share Repurchase Type |  | Shares |  |  |  | Amount (in millions)
Open Market Repurchases |  | 477,281 |  |  |  |  | $ | 16 |

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