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Retirement and Deferred Compensation Plan - 401(k) Retirement Plan (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Defined Contribution Plan Disclosure [Line Items] |  |  |
Employer matching contribution percentage | 50.00% |  |
Percentage of maximum contributions per employee | 6.00% |  |
Contribution vesting period | 5 years |  |
Employer contribution amount | $ 3.4 | $ 3.6 | $ 3.3
Total matching contributions forfeited by plan participants during period | $ 1.0 | $ 0.7 | $ 0.7
Minimum |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Percentage of employee deferral or contribution | 1.00% |  |
Maximum |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Percentage of employee deferral or contribution | 80.00% |  |

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- Definition Defined Contribution Plan, Employee Deferral Rate + References No definition available. + Details
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- Definition Defined Contribution Plan, Employee Forfeitures + References No definition available. + Details
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- Definition Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, 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 710 -SubTopic 10 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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