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Income Taxes - Summary of Valuation Allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Valuation allowance, beginning of year | $ 22,283 | $ 52,085 | $ 205,423
Net release of valuation allowance | 0 | 0 | (134,235)
Net decrease in deferred tax assets with a full valuation allowance | (588) | (29,802) | (19,103)
Valuation allowance, end of year | $ 21,695 | $ 22,283 | $ 52,085

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- Definition Valuation Allowance, Net Increase (Decrease) In Deferred Tax Assets For Jurisdictions With A Full Valuation Allowance + References No definition available. + Details
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- Definition Valuation allowance, Release of valuation allowance + References No definition available. + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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