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Stock-Based Compensation - Employee Stock Purchase Plan (Details) - shares | 6 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares issued under employee stock purchase plan (in shares) | 39,479 | 51,133
Employee Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Purchase price of common stock (as a percent) | 85.00% |

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- Definition Purchase price of common stock expressed as a percentage of its fair value. + References No definition available. + Details
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