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Stock Award Plans - Nonvested Stock Options (Details) - $ / shares | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Options Outstanding |  |  |
Outstanding at beginning of period (in shares) | 981,410 | 1,031,134 | 1,210,689
Granted (in shares) | 779,740 | 352,043 | 0
Vested (in shares) | (217,695) | (223,387) | 0
Forfeited (in shares) | (153,033) | (178,380) | (179,555)
Outstanding at end of period (in shares) | 1,390,422 | 981,410 | 1,031,134
Weighted Average Grant Date Fair Value |  |  |
Outstanding at beginning of period (in dollars per share) | $ 5.07 | $ 4.39 | $ 4.38
Granted (in dollars per share) | 7.11 | 7.18 | 0
Vested (in dollars per share) | 6.13 | 5.32 | 0
Forfeited (in dollars per share) | 5.38 | 5.02 | 4.31
Outstanding at end of period (in dollars per share) | $ 5.93 | $ 5.07 | $ 4.39

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- Definition Gross number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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