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Discontinued Operations of TS Segment (Details)
€ in Thousands, $ in Thousands
12 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Jul. 31, 2018
EUR (€)
Jul. 31, 2018
USD ($)
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]        
Loss from discontinued operations $ (410)      
Gain from sale of discontinued operations 16,838      
Net income from discontinued operations 16,428      
Modcom GmbH | Discontinued Operations, Disposed of by Sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Cash at closing       $ 14,400
Original purchase price       11,700
Adjustment at closing       $ 2,700
Amount in escrow | €     € 400  
Disposal Group, Including Discontinued Operation, Liabilities, Total 0 $ 0    
Disposal Group, Including Discontinued Operation, Assets 0 $ 0    
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]        
Sales 18,365      
Cost of sales 15,843      
Gross profit 2,522      
Selling, general and administrative expenses 2,837      
Operating loss (315)      
Other expenses (95)      
Loss before income taxes (410)      
Income tax expense 0      
Loss from discontinued operations (410)      
Gain from sale of discontinued operations 16,838      
Net income from discontinued operations $ 16,428