Accrued Expenses (Details) - USD ($) $ in Thousands	Aug. 31, 2018	Aug. 31, 2017
Accrued Liabilities, Current [Abstract]
Deferred income	$ 691,365	$ 1,017,144
Accrued compensation and employee benefits	570,400	534,143
Other accrued expenses	1,000,979	617,428
Accrued expenses	$ 2,262,744	$ 2,168,715