Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Allowance for doubtful accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves, beginning balance	$ 167	$ 249
Additions (Reductions) Charged to Expense	(3)	(91)
Additions (Reductions) Charged to Other Accounts	0	0
Deductions	(53)	9
Valuation allowances and reserves, ending balance	111	167
Inventory valuation accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves, beginning balance	3,769	3,676
Additions (Reductions) Charged to Expense	1,983	275
Additions (Reductions) Charged to Other Accounts	11	(180)
Deductions	(679)	(2)
Valuation allowances and reserves, ending balance	5,084	3,769
Inventory LIFO reserve
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves, beginning balance	9,210	8,286
Additions (Reductions) Charged to Expense	729	924
Additions (Reductions) Charged to Other Accounts	0	0
Deductions	0	0
Valuation allowances and reserves, ending balance	9,939	9,210
Deferred tax valuation allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves, beginning balance	4,641	5,329
Additions (Reductions) Charged to Expense	3,360	345
Additions (Reductions) Charged to Other Accounts	(284)	(1,033)
Deductions	0	0
Valuation allowances and reserves, ending balance	7,717	4,641
Workers’ compensation reserve
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves, beginning balance	888	546
Additions (Reductions) Charged to Expense	741	1,241
Additions (Reductions) Charged to Other Accounts	0	(53)
Deductions	(717)	(846)
Valuation allowances and reserves, ending balance	$ 912	$ 888