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Business Acquisitions (Additional Information) (Details 1) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 01, 2017
Jan. 13, 2016
Jul. 01, 2015
Nov. 30, 2015
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2015
Business Acquisition [Line Items]              
Goodwill         $ 8,186 $ 135,107  
DMS [Member]              
Business Acquisition [Line Items]              
Goodwill         $ 8,186 111,417  
EMS [Member]              
Business Acquisition [Line Items]              
Goodwill           $ 23,690  
Lewis Engineering [Member]              
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 [Member] | DMS [Member]              
Business Acquisition [Line Items]              
Goodwill $ 8,200            
Hanson [Member]              
Business Acquisition [Line Items]              
Amount of cash paid for business acquisitions   $ 139,200          
Assets acquired   406,400          
Liabilities assumed   230,000          
Real property   33,300          
Property, plant and equipment acquired   276,800          
Intangible assets and goodwill acquired   129,600          
Deferred tax liabilities assumed   $ 3,900          
Inala and Shemer [Member]              
Business Acquisition [Line Items]              
Amount of cash paid for business acquisitions       $ 72,300      
Assets acquired       92,200      
Goodwill       19,300      
Intangible assets acquired       31,400      
Liabilities assumed       19,900      
Inala and Shemer [Member] | EMS [Member]              
Business Acquisition [Line Items]              
Goodwill       $ 19,300      
Plasticos [Member]              
Business Acquisition [Line Items]              
Amount of cash paid for business acquisitions     $ 111,000        
Percentage of equity interest acquired     100.00%        
Five Additional Acquisitions [Member]              
Business Acquisition [Line Items]              
Amount of cash paid for business acquisitions             $ 117,000