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Stock Award Plans - Nonvested Stock Options (Details) - $ / shares | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Options Outstanding |  |  |
Outstanding at beginning of period (in shares) | 1,390,422 | 981,410 | 1,031,134
Granted (in shares) | 0 | 779,740 | 352,043
Vested (in shares) | (412,160) | (217,695) | (223,387)
Forfeited (in shares) | (135,011) | (153,033) | (178,380)
Outstanding at end of period (in shares) | 843,251 | 1,390,422 | 981,410
Weighted Average Grant Date Fair Value |  |  |
Outstanding at beginning of period (in dollars per share) | $ 5.93 | $ 5.07 | $ 4.39
Granted (in dollars per share) | 0 | 7.11 | 7.18
Vested (in dollars per share) | 3.20 | 6.13 | 5.32
Forfeited (in dollars per share) | 6.07 | 5.38 | 5.02
Outstanding at end of period (in dollars per share) | $ 5.50 | $ 5.93 | $ 5.07

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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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