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Employee Benefit Plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Defined contribution plan recognized expenses | $ 2.9 | $ 3.1 | $ 3.2
Deferred compensation, retirement age | 65 years |  |
Deferred compensation requisite service period | 10 years |  |
Deferred compensation recorded liability | $ 0.1 |  |
Cash surrender value of life insurance | $ 3.3 |  |
Maximum |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Age older but less than | 65 years |  |
Retiree medical plan |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Deferred compensation requisite service period | 10 years |  |
Unfunded liability | $ 0.9 | 0.9 |
Retiree medical plan | Minimum |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Age older but less than | 55 years |  |
Retiree medical plan | Maximum |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Net periodic postretirement benefit cost (less than) | $ 0.1 | $ 0.1 | $ 0.1
Deferred compensation plan |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Percentage of employee based salary permitted for deferral under the plan | 50.00% |  |
Percentage of employee annual bonus permitted for deferral under the plan | 100.00% |  |
Deferred compensation expense adjustment | $ 0.4 |  |
Deferred compensation plan assets | 9.1 |  |
Deferred compensation liability | 8.5 |  |
Deferred compensation plan | Company owned life insurance policies |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Deferred compensation plan assets | $ 9.1 |  |

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