Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Allowance for credit losses
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves, beginning balance	$ 117	$ 237
Additions (Reductions) Charged to Expense	102	(90)
Additions (Reductions) Charged to Other Accounts	0	0
Deductions	(68)	(30)
Valuation allowances and reserves, ending balance	151	117
Inventory valuation accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves, beginning balance	2,733	2,164
Additions (Reductions) Charged to Expense	3,014	489
Additions (Reductions) Charged to Other Accounts	5	0
Deductions	167	80
Valuation allowances and reserves, ending balance	5,919	2,733
Inventory LIFO reserve
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves, beginning balance	10,496	9,634
Additions (Reductions) Charged to Expense	401	862
Additions (Reductions) Charged to Other Accounts	0	0
Deductions	0	0
Valuation allowances and reserves, ending balance	10,897	10,496
Deferred tax valuation allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves, beginning balance	10,900	9,112
Additions (Reductions) Charged to Expense	116	2,000
Additions (Reductions) Charged to Other Accounts	(364)	(212)
Deductions	0	0
Valuation allowances and reserves, ending balance	10,652	10,900
Workers’ compensation reserve
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves, beginning balance	303	559
Additions (Reductions) Charged to Expense	89	(49)
Additions (Reductions) Charged to Other Accounts	0	0
Deductions	(191)	(207)
Valuation allowances and reserves, ending balance	$ 201	$ 303