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Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Feb. 28, 2022 | Mar. 31, 2022 | Mar. 31, 2021 | Sep. 30, 2021
Restricted Stock Units (RSUs) |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Vesting period |  | 3 years |  |
Unvested restricted stock outstanding (in shares) |  | 235,502 |  | 199,919
Compensation expense |  | $ 1.4 | $ 1.3 |
Granted (in shares) |  | 107,350 |  |
Restricted Stock Units (RSUs) | Time Based Restricted Stock Unit |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Vesting period |  | 3 years |  |
Restricted Stock Units (RSUs) | Performance Based Restricted Stock Unit |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Vesting period |  | 3 years |  |
Restricted Stock |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Compensation expense |  | $ 0.3 | $ 0.4 |
Restricted Stock | Non-Employee Director Equity Incentive Plan |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Shares issued under the plan (in shares) |  | 2,400 |  |
Restricted stock issued (in shares) | 16,800 |  |  |
Shares issued, price per share (in shares) | $ 23.09 |  |  |
Restricted Stock | Non-Employee Director Equity Incentive Plan | Immediate Vesting |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Vesting, percentage |  | 50.00% |  |
Restricted Stock | Non-Employee Director Equity Incentive Plan | Anniversary of Grant Date |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Vesting, percentage |  | 50.00% |  |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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