CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - shares |
12 Months Ended | ||
|---|---|---|---|
Sep. 30, 2021 |
Sep. 30, 2020 |
Sep. 30, 2019 |
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| Statement of Stockholders' Equity [Abstract] | |||
| Purchase of treasury stock (in shares) | 380,109 | 173,576 | 709,970 |
| Issuance of treasury stock (in shares) | 53,377 | 12,125 | 3,782 |
| Cancellation of treasury stock (in shares) | 34,727 | 23,461 | 20,114 |
| Contribution of treasury stock (in shares) | 668,000 | ||
| X | ||||||||||
- Definition Treasury Stock, Shares, Contributed No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Number of treasury shares or units reissued. Excludes reissuance of shares or units in treasury for award under share-based payment arrangement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Number of shares that have been repurchased during the period and are being held in treasury. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Number of shares of common and preferred stock retired from treasury during the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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