Inventories (Details) - USD ($) $ in Thousands	May 31, 2018	Aug. 31, 2017
Inventory Disclosure [Abstract]
Raw materials	$ 1,886,967	$ 1,574,241
Work in process	832,153	822,628
Finished goods	682,517	591,227
Reserve for excess and obsolete inventory	(57,855)	(46,013)
Inventories, net	$ 3,343,782	$ 2,942,083