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Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Feb. 29, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Sep. 30, 2019
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) |  | 154,034 |  | 131,850
Compensation expense |  | $ 1.9 | $ 1.8 |
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 |  | $ 0.5 | $ 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) | $ 36.25 |  |  |
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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