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Income Taxes - Summary of Changes in Valuation Allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Valuation Allowance [Line Items] |  |  |
Balance at beginning of period | $ 5,973,000 | $ 5,853,000 | $ 5,518,000
Valuation allowance, deferred tax asset, increase (decrease), amount | 121,000 | 27,000 |
Balance at end of period | 6,378,000 | 5,973,000 | 5,853,000
Allowance provision for new operating and other loss carryforwards |  |  |
Valuation Allowance [Line Items] |  |  |
Valuation allowance, deferred tax asset, increase (decrease), amount | 573,000 | 325,000 | 505,000
Allowance benefits |  |  |
Valuation Allowance [Line Items] |  |  |
Valuation allowance, deferred tax asset, increase (decrease), amount | $ (168,000) | $ (205,000) | $ (170,000)

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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 Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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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 No definition available. + Details
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- Details
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