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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Operating Loss Carryforwards [Line Items] |  |  |
Valuation allowance | $ 284,626 | $ 242,394 |
Income tax expense related to uncertain tax positions | 0 | $ 3,500 | $ 0
Unrecognized tax benefits, interest accrued | 600 |  |
Unrecognized tax benefits, penalties accrued | 900 |  |
Unrecognized tax benefits that would impact effective tax rate | 3,500 |  |
Change in unrecognized tax benefits expected | 3,500 |  |
Federal |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 134,300 |  |
Operating loss carryforwards subject to expiration | 34,000 |  |
Operating loss carryforwards not subject to expiration | 100,300 |  |
State |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 491,500 |  |
Operating loss carryforwards not subject to expiration | $ 2,900 |  |

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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 operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-3 + Details
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- Definition Amount of statutory penalties accrued for a tax position claimed or expected to be claimed by the entity, in its tax return. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15 + Details
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- Definition Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15 + Details
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