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Inventories (Details) - USD ($)
$ in Thousands
Feb. 28, 2018
Aug. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 1,893,693 $ 1,574,241
Work in process 873,827 822,628
Finished goods 679,827 591,227
Reserve for excess and obsolete inventory (59,352) (46,013)
Inventories, net $ 3,387,995 $ 2,942,083