Income Taxes - Summary of Changes in Valuation Allowances for Deferred Tax Assets (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Valuation Allowance [Roll Forward]
Balance at Beginning of Year	$ 0	$ 57,645	$ 63,205
Additions	0	0	0
Deductions	0	57,645	5,560
Balance at End of Year	$ 0	$ 0	$ 57,645

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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

Name:	us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant