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Employee Benefit Plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Defined contribution plan recognized expenses | $ 3.1 | $ 3.2 | $ 2.8
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 | $ 0.1 |  |
Deferred compensation plan assets | 7.4 |  |
Deferred compensation liability | 6.6 |  |
Deferred compensation plan | Company owned life insurance policies |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Deferred compensation plan assets | $ 7.2 |  |

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- Definition Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6812-107765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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