Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 496
Balance at Beginning of Period	34,960
Charged to Costs and Expenses, net of Recoveries	(76)	$ 63
Balance at End of Period	428	496
Balance at End of Period	36,936	34,960
Inventory Obsolescence Reserve
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	34,960	32,050
Charged to Costs and Expenses	3,001	4,726
(Deductions) and Additions	(1,025)	(1,816)
Balance at End of Period	36,936	34,960
Allowance for Doubtful Accounts on Accounts and Financing Receivables
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	496	951
Charged to Costs and Expenses, net of Recoveries	(76)	63
(Deductions) and Additions	8	(518)
Balance at End of Period	$ 428	$ 496