Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands		12 Months Ended
		Sep. 30, 2017	Sep. 30, 2016
Allowance for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves, beginning balance		$ 706	$ 1,127
Additions (Reductions) Charged to Expense		77	359
Additions (Reductions) Charged to Other Accounts		8	(199)
Deductions	[1]	(461)	(581)
Valuation allowances and reserves, ending balance		330	706
Inventory obsolescence reserve
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves, beginning balance		3,308	3,022
Additions (Reductions) Charged to Expense		657	571
Additions (Reductions) Charged to Other Accounts		91	0
Deductions	[2]	(197)	(285)
Valuation allowances and reserves, ending balance		3,859	3,308
Inventory LIFO reserve
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves, beginning balance		8,026	8,508
Additions (Reductions) Charged to Expense		293	(482)
Additions (Reductions) Charged to Other Accounts		0	0
Deductions		0	0
Valuation allowances and reserves, ending balance		8,319	8,026
Deferred tax valuation allowance
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves, beginning balance		4,399	1,095
Additions (Reductions) Charged to Expense		6,117	3,304
Additions (Reductions) Charged to Other Accounts		(919)	0
Deductions		0	0
Valuation allowances and reserves, ending balance		9,597	4,399
Workers’ compensation reserve
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves, beginning balance		324	688
Additions (Reductions) Charged to Expense		234	157
Additions (Reductions) Charged to Other Accounts		1	0
Deductions	[3]	(322)	(521)
Valuation allowances and reserves, ending balance		$ 237	$ 324

[1] Accounts determined to be uncollectible, net of recoveries

[2] Inventory sold or otherwise disposed

[3] (c)Payment of workers’ compensation claims