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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Income Taxes [Line Items] |  |  |
Interest expense carryovers | $ 6,457 |  |
Operating loss carryforwards, valuation allowance | 21,100 | $ 2,900 |
Unrecognized tax benefits if unrecognized, the balance of uncertain tax benefits would impact the effective tax rate | $ 4,900 | 4,900 | $ 4,900
Domestic Tax Authority [Member] |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carryforwards not subject to expiration |  | $ 194,200 |
Effective income tax rate reconciliation, at federal statutory income tax rate, percent | 80.00% |  |
Interest expense carryovers | $ 29,100 |  |
Domestic Tax Authority [Member] | 2027-2038 [Member] |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carryforwards | 562,600 |  |
State and Local Jurisdiction [Member] | 2022-2042 [Member] |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carryforwards | $ 233,500 |  |
Minimum [Member] | Domestic Tax Authority [Member] |  |  |
Income Taxes [Line Items] |  |  |
Operating loss carryforwards, expiration year | 2027 |  |
Minimum [Member] | State and Local Jurisdiction [Member] |  |  |
Income Taxes [Line Items] |  |  |
Operating loss carryforwards, expiration year | 2023 |  |
Maximum [Member] | Domestic Tax Authority [Member] |  |  |
Income Taxes [Line Items] |  |  |
Operating loss carryforwards, expiration year | 2038 |  |
Maximum [Member] | State and Local Jurisdiction [Member] |  |  |
Income Taxes [Line Items] |  |  |
Operating loss carryforwards, expiration year | 2043 |  |

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- Definition Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible interest carryforward. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-6 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are subject to expiration dates. + References No definition available. + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479360/740-10-S99-1 + Details
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