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Supplemental Cash Flow Data (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2020
Aug. 31, 2019
Aug. 31, 2018
Supplemental Cash Flow Data      
Income taxes paid $ 11,186 $ 11,714 $ 20,142
Interest paid 230 728 915
Common stock received for payment of stock option exercises 123 119 1,028
Property, plant and equipment additions included in accounts payable 92 67 197
Randolph, MA - Property      
Sale of business      
Asset held for sale (14)    
Gain on sale of business (1,791)    
Cash received from sale of business, net of transaction costs 1,805    
Pawtucket, RI manufacturing facility      
Sale of business      
Asset held for sale (1,050)    
Gain on sale of business (760)    
Cash received from sale of business, net of transaction costs $ 1,810    
Zappa Stewart      
Acquisition of certain assets      
Current assets     10,478
Property, plant and equipment     1,872
Goodwill and Intangible assets     64,378
Deferred tax liability     (2,626)
Accounts payable and accrued liabilities     (633)
Payments for acquisitions, net of cash acquired     (73,469)
Structural Composites Rod Business      
Sale of business      
Inventory     (522)
Goodwill and Intangible assets     (230)
Gain on sale of business     (1,480)
Cash received from sale of business, net of transaction costs     2,232
Structural Composites License      
Sale of business      
Property and equipment     (26)
Gain on sale of business     (1,085)
Accrued income taxes     111
Cash received from sale of business, net of transaction costs     $ 1,000
Fiber Optic Cable Components Product Line      
Sale of business      
Due from sale of business   (400)  
Cash received from sale of business, net of transaction costs   $ 400