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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - shares | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Statement of Stockholders' Equity [Abstract] |  |  |
Purchase of treasury stock (in shares) | 99,829 | 1,363,785 | 380,109
Issuance of treasury stock (in shares) | 305,318 | 223,033 | 53,377
Cancellation of treasury stock (in shares) | 34,327 | 31,309 | 34,727

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