Income Taxes - Schedule of Changes in Deferred Tax Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Deferred Tax Valuation Allowance [Roll Forward]
Balance at the beginning of the year	$ 20,000	$ 23,292
Additions (reductions) to valuation allowance	1,506	(3,292)
Balance at the end of the year	$ 21,506	$ 20,000