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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Sep. 30, 2022
Share-Based Payment Arrangement [Abstract] |
Summary of Company's Share Awards | The following table summarizes the activity for the Company’s unvested share awards under the Plan:
| Deferred Equity Units |  | Matching Equity Units |  | Deferred Equity Units Weighted-Average Intrinsic Value |  | Matching Equity Units Weighted-Average Intrinsic Value |  | Deferred Equity Units Weighted-Average Grant-Date Intrinsic Value |  | Matching Equity Units Weighted-Average Grant-Date Intrinsic Value
Unvested units at September 30, 2020 | 549,454 |  |  | 4,311,861 |  |  | $ | 27.01 |  |  | $ | 23.82 |  |  | $ | 23.82 |  |  | $ | — |
Granted | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Vested | (549,454) |  |  | (2,303,578) |  |  | 44.21 |  |  | 41.02 |  |  | 41.02 |  |  | — |
Forfeited | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Unvested units at September 30, 2021 | — |  |  | 2,008,283 |  |  | $ | — |  |  | $ | 41.02 |  |  | $ | — |  |  | $ | — |
Granted | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Vested | — |  |  | (1,458,829) |  |  | — |  |  | 20.02 |  |  | — |  |  | — |
Forfeited | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Unvested units at September 30, 2022 | — |  |  | 549,454 |  |  | $ | — |  |  | $ | 20.02 |  |  | $ | — |  |  | $ | — |
Schedule of Unvested Restricted Stock Units Roll Forward | The following table summarizes the activity for the Company’s unvested RSUs:
| Number of Share Units |  | Weighted-Average Grant Date Fair Value
Unvested and outstanding balance as of September 30, 2021 | 1,535,367 |  |  | $ | 32.29 |
Granted | 875,934 |  |  | 44.38 |
Vested | (432,816) |  |  | 29.75 |
Forfeited/canceled | (87,210) |  |  | 31.73 |
Unvested and outstanding balance as of September 30, 2022 | 1,891,275 |  |  | $ | 38.50 |

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- Definition Tabular disclosure of activity for outstanding award under share-based payment arrangement excluding share and unit options and nonvested award. + 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) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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