Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Allowance for doubtful accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves, beginning balance	$ 111	$ 167
Additions (Reductions) Charged to Expense	143	(3)
Additions (Reductions) Charged to Other Accounts	4	0
Deductions	(16)	(53)
Valuation allowances and reserves, ending balance	242	111
Inventory valuation accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves, beginning balance	5,084	3,769
Additions (Reductions) Charged to Expense	188	1,983
Additions (Reductions) Charged to Other Accounts	0	11
Deductions	(930)	(679)
Valuation allowances and reserves, ending balance	4,342	5,084
Inventory LIFO reserve
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves, beginning balance	9,939	9,210
Additions (Reductions) Charged to Expense	(305)	729
Additions (Reductions) Charged to Other Accounts	0	0
Deductions	0	0
Valuation allowances and reserves, ending balance	9,634	9,939
Deferred tax valuation allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves, beginning balance	7,717	4,641
Additions (Reductions) Charged to Expense	2,574	3,360
Additions (Reductions) Charged to Other Accounts	(399)	(284)
Deductions	0	0
Valuation allowances and reserves, ending balance	9,892	7,717
Workers’ compensation reserve
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves, beginning balance	912	888
Additions (Reductions) Charged to Expense	285	741
Additions (Reductions) Charged to Other Accounts	0	0
Deductions	(638)	(717)
Valuation allowances and reserves, ending balance	$ 559	$ 912