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Inventories (Details) - USD ($)
$ in Thousands
May 31, 2017
Aug. 31, 2016
Inventories [Abstract]    
Raw materials $ 1,468,471 $ 1,302,481
Work in process 722,833 675,867
Finished goods 567,556 510,485
Reserve for inventory obsolescence (52,330) (32,221)
Total inventories $ 2,706,530 $ 2,456,612