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v3.20.2

Employee Benefit Plan - Additional Information (Details) - Savings Plan - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |
Defined contribution plan, percentage of employee's contributions matched by employer | 50.00% |  |
Defined contribution plan, percentage of employer contribution on employee's earnings | 3.00% |  |
Defined contribution plan, employers contribution, rate of vesting, percentage | 25.00% |  |
Defined contribution plan, vesting period | 4 years |  |
Matching contributions by employer | $ 6.7 | $ 6.0 | $ 5.8

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- Definition Defined Contribution Plan, Vesting Period + References No definition available. + 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 cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + 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 Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Definition Percentage of employer's matching contributions to a defined contribution plan that vests in a given year. + References No definition available. + Details
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- Details
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