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Inventory (Details) - USD ($)
$ in Thousands
Aug. 31, 2019
Sep. 01, 2018
Aug. 31, 2018
Inventory      
Raw materials $ 20,325   $ 21,998
Work in process 8,748   7,653
Finished goods 13,281   10,048
Total Inventory $ 42,354 $ 39,649 $ 39,699