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Inventories (Detail) - USD ($)
$ in Thousands
Aug. 31, 2017
Aug. 31, 2016
Inventories [Abstract]    
Raw materials $ 1,574,241 $ 1,302,481
Work in process 822,628 675,867
Finished goods 591,227 510,485
Reserve for inventory obsolescence (46,013) (32,221)
Total inventories $ 2,942,083 $ 2,456,612