Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021
Debt
Total borrowings	$ 153,000	$ 154,000
Current portion of long-term debt	(20,000)	(20,000)
Total long-term debt, less current portion	$ 133,000	$ 134,000

Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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