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Income Taxes - Summary of Changes in Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Valuation Allowance [Line Items]
Balance at beginning of period	$ 6,279,000	$ 5,906,000	$ 5,812,000
Valuation allowance, deferred tax asset, increase (decrease), amount	48,000	121,000
Balance at end of period	6,258,000	6,279,000	5,906,000
Allowance provision for new operating and other loss carryforwards
Valuation Allowance [Line Items]
Valuation allowance, deferred tax asset, increase (decrease), amount	215,000	544,000	306,000
Allowance reductions
Valuation Allowance [Line Items]
Valuation allowance, deferred tax asset, increase (decrease), amount	$ (236,000)	$ (171,000)	$ (212,000)

X

- 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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X

- 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

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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.

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