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Goodwill and Intangible Assets - Other Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
IntangibleAssets [Line Items]    
Gross Carrying Amount $ 35,871 $ 5,940
Accumulated Amortization 4,148 1,217
INTANGIBLE ASSETS, net of amortization 31,723 4,723
Trademarks And Trade Names - Indefinite [Member]    
IntangibleAssets [Line Items]    
Gross Carrying Amount   1,200
Accumulated Amortization   0
INTANGIBLE ASSETS, net of amortization   1,200
Trademarks And Trade Names - Indefinite [Member]    
IntangibleAssets [Line Items]    
Gross Carrying Amount 3,845 200
Accumulated Amortization 139 9
INTANGIBLE ASSETS, net of amortization $ 3,706 $ 191
Trademarks And Trade Names - Indefinite [Member] | Minimum [Member]    
IntangibleAssets [Line Items]    
Estimated Useful Lives 5 years 8 years
Trademarks And Trade Names - Indefinite [Member] | Maximum [Member]    
IntangibleAssets [Line Items]    
Estimated Useful Lives 20 years  
Technical Library [Member]    
IntangibleAssets [Line Items]    
Estimated Useful Lives 20 years 20 years
Gross Carrying Amount $ 400 $ 400
Accumulated Amortization 61 41
INTANGIBLE ASSETS, net of amortization 339 359
Customer Relationships [Member]    
IntangibleAssets [Line Items]    
Gross Carrying Amount 27,414 3,600
Accumulated Amortization 2,003 788
INTANGIBLE ASSETS, net of amortization $ 25,411 $ 2,812
Customer Relationships [Member] | Minimum [Member]    
IntangibleAssets [Line Items]    
Estimated Useful Lives 6 years 8 years
Customer Relationships [Member] | Maximum [Member]    
IntangibleAssets [Line Items]    
Estimated Useful Lives 15 years 12 years
Covenants Not to Compete [Member]    
IntangibleAssets [Line Items]    
Estimated Useful Lives 3 years 3 years
Gross Carrying Amount   $ 140
Accumulated Amortization   121
INTANGIBLE ASSETS, net of amortization   $ 19
Develeoped Technology [Member]    
IntangibleAssets [Line Items]    
Estimated Useful Lives 4 years 4 years
Gross Carrying Amount $ 400 $ 400
Accumulated Amortization 358 258
INTANGIBLE ASSETS, net of amortization $ 42 $ 142
Order Backlog [Member]    
IntangibleAssets [Line Items]    
Estimated Useful Lives 1 year  
Gross Carrying Amount $ 1,621  
Accumulated Amortization 545  
INTANGIBLE ASSETS, net of amortization $ 1,076  
Construction Contract Value [Member]    
IntangibleAssets [Line Items]    
Estimated Useful Lives 1 year  
Gross Carrying Amount $ 2,191  
Accumulated Amortization 1,042  
INTANGIBLE ASSETS, net of amortization $ 1,149