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Equity Incentive Plans (Tables) | 12 Months Ended
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Sep. 30, 2022
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Restricted Stock Unit Activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant-Date
​ | ​ | Shares | ​ | Fair Value
Outstanding at September 30, 2021 |  | 1,088,652 | ​ | $ | 47.35
Granted |  | 249,685 | ​ | ​ | 99.62
Vested |  | (555,513) | ​ | ​ | 39.51
Forfeited |  | (244,586) | ​ | ​ | 64.31
Outstanding at September 30, 2022 |  | 538,238 | ​ | ​ | 71.99
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Time-Based |  | Stock |  | Performance-
​ | ​ | Total Units | ​ | Units | ​ | Grants | ​ | Based Units
Year ended September 30, 2022 |  | 249,685 |  | 120,066 |  | 18,471 |  | 111,148
Year ended September 30, 2021 |  | 349,930 | ​ | 166,570 |  | 14,713 |  | 168,647
Year ended September 30, 2020 |  | 412,036 | ​ | 163,390 |  | 27,076 |  | 221,570
​

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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