Benefit Plans - Additional Information (Details) - USD ($) |
12 Months Ended | |||
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Sep. 30, 2022 |
Sep. 30, 2021 |
Sep. 30, 2020 |
Sep. 30, 2019 |
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| Defined Contribution Plan Disclosure [Line Items] | ||||
| Employee matching contribution, percent | 60.00% | |||
| Employees auto enrolled upon eligibility, contribution rate | 6.00% | |||
| Employee contributions match | $ 400,000 | $ 300,000 | $ 300,000 | |
| Pension Plan | NIGPP | ||||
| Defined Contribution Plan Disclosure [Line Items] | ||||
| Multiemployer plan, agreement renewal period | 3 years | |||
| Multiemployer plan, agreement expiration date | Sep. 30, 2025 | |||
| Multiemployer plan, contribution amount | $ 38,000 | $ 39,000 | $ 44,000 | |
| Maximum | ||||
| Defined Contribution Plan Disclosure [Line Items] | ||||
| Employee participants eligible compensation each payroll period, percent | 3.60% | |||
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- Definition Defined contribution plan, annual contributions per employees auto enrolled upon eligibility, contribution rate No definition available.
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- Definition Multiemployer plan agreement expiration date. No definition available.
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- Definition Multiemployer plan agreement renewal period. No definition available.
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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. No definition available.
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. No definition available.
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. No definition available.
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- Definition Percentage employer matches of the employee's percentage contribution matched. No definition available.
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- Definition Amount of cost for employer contribution to multiemployer plan. Multiemployer plan includes, but is not limited to, pension plan determined to be individually significant and insignificant and other postretirement benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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