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Income Taxes - Summary of Valuation Allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Valuation allowance, beginning of year | $ 205,423 | $ 177,663 | $ 141,950
Net release of valuation allowance | (134,235) | 0 | (1,772)
Net increase (decrease) in deferred tax assets with a full valuation allowance | (19,103) | 27,760 | 37,485
Valuation allowance, end of year | $ 52,085 | $ 205,423 | $ 177,663

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + 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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