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Stock-Based Compensation - Summary of Stock Options Outstanding and Exercisable (Details) - $ / shares | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options - exercise price range, lower limit (in dollars per share) | $ 1 |  |  |
Stock Options Outstanding, Number Outstanding (in shares) | 114,259 | 392,465 | 523,754 | 533,052
Stock Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 17.89 | $ 15.47 | $ 14.34 | $ 14.26
Stock Options Exercisable, Number Exercisable (in shares) | 113,309 | 354,796 | 470,501 |
Stock Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 17.95 | $ 15.90 | $ 14.42 |
$1 - $10 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options - exercise price range, upper limit (in dollars per share) | $ 10 |  |  |
Stock Options Outstanding, Number Outstanding (in shares) | 15,436 |  |  |
Stock Options Outstanding - Weighted Average Contractual Remaining Life (Years) | 4 years 7 months 6 days |  |  |
Stock Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 9.17 |  |  |
Stock Options Exercisable, Number Exercisable (in shares) | 14,536 |  |  |
Stock Options Exercisable - Weighted Average Contractual Remaining Life (Years) | 4 years 6 months |  |  |
Stock Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 9.09 |  |  |
$11 - $15 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options - exercise price range, lower limit (in dollars per share) | 11 |  |  |
Stock options - exercise price range, upper limit (in dollars per share) | $ 15 |  |  |
Stock Options Outstanding, Number Outstanding (in shares) | 315 |  |  |
Stock Options Outstanding - Weighted Average Contractual Remaining Life (Years) | 3 years 6 months |  |  |
Stock Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 11.61 |  |  |
Stock Options Exercisable, Number Exercisable (in shares) | 265 |  |  |
Stock Options Exercisable - Weighted Average Contractual Remaining Life (Years) | 2 years 10 months 24 days |  |  |
Stock Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 11.36 |  |  |
$16 -$20 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options - exercise price range, lower limit (in dollars per share) | 16 |  |  |
Stock options - exercise price range, upper limit (in dollars per share) | $ 20 |  |  |
Stock Options Outstanding, Number Outstanding (in shares) | 98,508 |  |  |
Stock Options Outstanding - Weighted Average Contractual Remaining Life (Years) | 7 months 6 days |  |  |
Stock Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 19.28 |  |  |
Stock Options Exercisable, Number Exercisable (in shares) | 98,508 |  |  |
Stock Options Exercisable - Weighted Average Contractual Remaining Life (Years) | 7 months 6 days |  |  |
Stock Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 19.28 |  |  |
$1 - $20 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options - exercise price range, lower limit (in dollars per share) | 1 |  |  |
Stock options - exercise price range, upper limit (in dollars per share) | $ 20 |  |  |
Stock Options Outstanding, Number Outstanding (in shares) | 114,259 |  |  |
Stock Options Outstanding - Weighted Average Contractual Remaining Life (Years) | 1 year 2 months 12 days |  |  |
Stock Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 17.89 |  |  |
Stock Options Exercisable, Number Exercisable (in shares) | 113,309 |  |  |
Stock Options Exercisable - Weighted Average Contractual Remaining Life (Years) | 1 year 1 month 6 days |  |  |
Stock Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 17.95 |  |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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