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Benefit Plans - Additional Information (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Defined Contribution Plan Disclosure [Line Items] |  |  |
Employee matching contribution, percent | 60.00% |  |
Employees auto enrolled upon eligibility, contribution rate | 6.00% |  |
Employee contributions match | $ 500,000 | $ 400,000 | $ 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 | $ 36,000 | $ 38,000 | $ 39,000
Maximum |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Employee participants eligible compensation each payroll period, percent | 3.60% |  |

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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480794/715-70-50-1 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 80 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480547/715-80-55-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 80 -Name Accounting Standards Codification -Section 35 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480606/715-80-35-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 80 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480576/715-80-50-11 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 80 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480576/715-80-50-9 + Details
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