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Discontinued Operations (Details)
€ in Thousands, $ in Thousands
 12 Months Ended
Jul. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Jul. 31, 2018
EUR (€)
Jul. 31, 2018
USD ($)
Currents assets:          
Cash and cash equivalents   $ 0 $ 3,464    
Total current assets of discontinued operations   0 14,867    
Noncurrent assets:          
Total noncurrent assets of discontinued operations   0 2,188    
Current liabilities:          
Total current liabilities of discontinued operations   0 9,727    
Noncurrent liabilities:          
Total noncurrent liabilities of discontinued operations   0 5,222    
Modcom GmbH | Disposal Group, Not Discontinued Operations          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Cash received at closing         $ 14,400
Original purchase price         11,700
Purchase price adjustment         $ 2,700
Contingent consideration held in escrow | €       € 400  
Gain recorded due to disposal $ 16,800 16,838 0    
Currents assets:          
Cash and cash equivalents   0 3,464    
Accounts receivable, net   0 9,957    
Unbilled accounts receivable   0 69    
Inventories, net   0 404    
Deferred costs   0 910    
Deferred income taxes   0 0    
Other current assets   0 63    
Property, equipment and improvements, net   0 0    
Total current assets of discontinued operations   0 14,867    
Noncurrent assets:          
Property, equipment and improvements, net   0 589    
Deferred costs   0 609    
Deferred income taxes   0 864    
Other noncurrent assets, net   0 126    
Total noncurrent assets of discontinued operations   0 2,188    
Current liabilities:          
Accounts payable and accrued expenses   0 3,950    
Deferred revenue   0 5,264    
Pension and retirement plans   0 209    
Other current liabilities   0 304    
Total current liabilities of discontinued operations   0 9,727    
Noncurrent liabilities:          
Pension and retirement plans   0 5,165    
Other noncurrent liabilities   0 57    
Total noncurrent liabilities of discontinued operations   0 5,222    
Income statement disclosures          
Sales   18,365 22,990    
Cost of sales   15,843 18,923    
Gross profit   2,522 4,067    
Selling, general and administrative expenses   2,837 3,690    
Operating income (loss)   (315) 377    
Other (expenses), net   (95)      
Other income, net     11    
Gain (loss) before income taxes   (410) 388    
Income tax expense   0 125    
Income (loss) from discontinued operations   (410) 263    
Gain recorded due to disposal $ 16,800 16,838 0    
Total income from discontinued operations   $ 16,428 $ 263