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Business Acquisitions (Fiscal Year 2017) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 01, 2017
Aug. 31, 2018
Aug. 31, 2017
Business Acquisition [Line Items]      
Goodwill   $ 22,577 $ 8,186
DMS      
Business Acquisition [Line Items]      
Goodwill   $ (8,186) $ 8,186
Lewis Engineering      
Business Acquisition [Line Items]      
Amount of cash paid for business acquisitions $ 31,400    
Assets acquired 32,300    
Goodwill 8,200    
Intangible assets acquired 14,600    
Liabilities assumed 900    
Transaction costs 800    
Lewis Engineering | DMS      
Business Acquisition [Line Items]      
Goodwill $ 8,200