Supplementary Balance Sheet Information - Valuation Allowance for Deferred Tax Assets Activity (Details) - Valuation Allowance, Deferred Tax Asset - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance, Beginning Balance	$ 8,592	$ 10,623	$ 12,843
Charged to Provisions	1,337	(3,247)	(2,514)
Charged to Other Accounts	4,002	(1,216)	(294)
Valuation Allowances and Reserves, Balance, Ending Balance	$ 5,927	$ 8,592	$ 10,623