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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - shares | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Statement of Stockholders' Equity [Abstract] |  |  |
Purchase of treasury stock (in shares) | 709,970 | 393,864 | 212,424
Issuance of treasury stock (in shares) | 3,782 | 326,827 | 221,958
Cancellation of treasury stock (in shares) | 20,114 | 6,756 | 2,640

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