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Valuation and Qualifying Accounts (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Allowance for doubtful accounts [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Valuation allowances and reserves, beginning balance $ 481 $ 500 $ 502
Additions (Reductions) Charged to Expense 9 81 107
Additions (Reductions) Charged to Other Accounts 1 47 107
Deductions (158) [1] (147) [1] (216) [1]
Valuation allowances and reserves, ending balance 333 481 500
Inventory obsolescence reserve [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Valuation allowances and reserves, beginning balance 1,394 1,192 968
Additions (Reductions) Charged to Expense 131 520 (136)
Additions (Reductions) Charged to Other Accounts (118) (318) 365
Deductions 0 [2] 0 [2] (5) [2]
Valuation allowances and reserves, ending balance 1,407 1,394 1,192
Inventory LIFO reserve [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Valuation allowances and reserves, beginning balance 7,977 9,537 7,974
Additions (Reductions) Charged to Expense (98) (1,560) 1,563
Additions (Reductions) Charged to Other Accounts 0 0 0
Deductions 0 0 0
Valuation allowances and reserves, ending balance 7,879 7,977 9,537
Asset impairment reserve [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Valuation allowances and reserves, beginning balance 72 757 757
Additions (Reductions) Charged to Expense 0 72 0
Additions (Reductions) Charged to Other Accounts (72) 0 0
Deductions 0 [3] (757) [3] 0 [3]
Valuation allowances and reserves, ending balance 0 72 757
Deferred tax valuation allowance [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Valuation allowances and reserves, beginning balance 718 579 452
Additions (Reductions) Charged to Expense 104 139 127
Additions (Reductions) Charged to Other Accounts 0 0 0
Deductions 0 0 0
Valuation allowances and reserves, ending balance 822 718 579
Workers' compensation reserve [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Valuation allowances and reserves, beginning balance 744 663 655
Additions (Reductions) Charged to Expense 515 82 173
Additions (Reductions) Charged to Other Accounts 0 0 (6)
Deductions (322) [4] (1) [4] (159) [4]
Valuation allowances and reserves, ending balance $ 937 $ 744 $ 663
[1] Accounts determined to be uncollectible, net of recoveries
[2] Inventory sold or otherwise disposed
[3] Equipment sold or otherwise disposed
[4] Payment of workers’ compensation claims