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Acquisitions (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2016
Nov. 30, 2016
Nov. 30, 2017
Aug. 31, 2017
Acquisitions        
Expenses related to acquisition   $ 27    
Acquisition cost has been allocated to the acquired tangible and identifiable intangible assets and liabilities assumed based on their fair values        
Goodwill     $ 50,911 $ 50,784
Resin Designs        
Acquisitions        
Purchase price $ 30,270      
Expenses related to acquisition   $ 584    
Acquisition cost has been allocated to the acquired tangible and identifiable intangible assets and liabilities assumed based on their fair values        
Accounts receivable 1,877      
Inventory 1,300      
Prepaid expenses and other current assets 63      
Property, plant and equipment 623      
Goodwill 7,592      
Intangible assets 19,450   $ 19,450  
Accounts payable and accrued expenses (635)      
Total purchase price 30,270      
Goodwill related to acquisitions that is deductible for income taxes $ 7,592