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Stock-Based Compensation (Tables) | 9 Months Ended
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Jun. 30, 2022
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of stock-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Nine Months Ended June 30, | ​
​ |  | 2022 |  | 2021 |  | 2022 |  | 2021 |
Restricted stock units | ​ | $ | 3,178 | ​ | $ | 5,475 | ​ | $ | 18,433 | ​ | $ | 18,667 | ​
Employee stock purchase plan | ​ |  | 307 | ​ |  | 611 | ​ |  | 1,600 | ​ |  | 1,610 | ​
Total stock-based compensation expense | ​ | $ | 3,485 | ​ | $ | 6,086 | ​ | $ | 20,033 | ​ | $ | 20,277 | ​
​
Restricted Stock Unit Activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Time-Based |  | Stock |  | Performance-
​ | ​ | Total Units | ​ | Units | ​ | Grants | ​ | Based Units
Nine months ended June 30, 2022 |  | 231,696 |  | 94,429 |  | 49,063 |  | 88,204
Nine months ended June 30, 2021 |  | 346,172 | ​ | 162,842 |  | 14,683 |  | 168,647
​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant-Date
​ | ​ | Shares | ​ | Fair Value
Outstanding at September 30, 2021 |  | 1,088,652 | ​ | $ | 47.35
Granted |  | 231,696 | ​ | ​ | 103.00
Vested |  | (555,513) | ​ | ​ | 41.50
Forfeited |  | (223,821) | ​ | ​ | 39.51
Outstanding at June 30, 2022 |  | 541,014 | ​ | ​ | 93.96

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + 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 (h)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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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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