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Sale of Businesses (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 03, 2017
Oct. 31, 2018
Aug. 31, 2018
May 31, 2018
May 31, 2017
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2017
Apr. 20, 2018
Sale of Businesses                  
Proceeds from the sale of property and assets           $ 400 $ 2,232 $ 3,915  
Revenue           281,351 284,188 252,560  
Product                  
Sale of Businesses                  
Revenue           2,062 2,186    
Selling, General and Administrative Expenses                  
Sale of Businesses                  
Revenue           169 275    
Other income (expense)                  
Sale of Businesses                  
Rental income           $ 130 $ 130    
Structural Composites Rod Business                  
Sale of Businesses                  
Total proceeds received or to be received                 $ 2,232
Pre-tax book gain from the sale of property and assets       $ 1,480          
Proceeds from the sale of property and assets     $ 157 $ 2,075          
Fiber Optic Cable Components Product Line                  
Sale of Businesses                  
Total proceeds received or to be received $ 3,858                
Pre-tax book gain from the sale of property and assets               $ 2,013  
Proceeds from the sale of property and assets   $ 400     $ 3,458        
Term of Escrow Deposit 18 months                
Fiber Optic Cable Components Product Line | Other Noncurrent Asset                  
Sale of Businesses                  
Sale price held in escrow         $ 400