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Discontinued Operations and Related Assets Held for Sale (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]      
Net (loss) income from discontinued operations $ (4,066) $ (2,565)  
Long-term Assets:      
Total long-term assets of discontinued operations     $ 0
Current Liabilities:      
Total current liabilities of discontinued operations 17,316   20,042
Long-term Liabilities:      
Other long-term obligations 1,040   850
Engineered Solutions [Member] | Discontinued Operations, Held-for-sale [Member]      
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]      
Net sales 31,765 29,089  
Cost of sales 28,412 25,985  
Gross profit 3,353 3,104  
Research and development 570 878  
Selling and administrative expenses 3,693 4,455  
Impairment 2,500 0 14,300
Operating loss (3,410) (2,229)  
Other expense 32 9  
Interest expense 607 719  
Loss from discontinued operations before income taxes (4,049) (2,957)  
Provision for (benefit from) income taxes on discontinued operations (17) 392  
Net (loss) income from discontinued operations (4,066) (2,565)  
Discontinued Operation, Alternative Cash Flow Information [Abstract]      
Depreciation and amortization 1,768 1,947  
Deferred income taxes 17 (393)  
Capital expenditures 228 $ 715  
Current Assets:      
Accounts receivable 18,899   17,094
Inventories 66,209   71,816
Prepaid expenses and other current assets 548   320
Long-term Assets:      
Net property plant and equipment 78,699   79,048
Other assets 11,864   12,608
Total long-term assets of discontinued operations 176,219   180,886
Impairment upon reclassification to discontinued operations (122,407)   (119,907)
Total assets of discontinued operations 53,812   60,979
Current Liabilities:      
Accounts payable 7,316   7,253
Accrued income and other taxes 1,834   2,326
Other accrued liabilities 8,166   10,463
Total current liabilities of discontinued operations 17,316   20,042
Long-term Liabilities:      
Other long-term obligations 1,040   850
Total liabilities of discontinued operations $ 18,356   $ 20,892