Leases (Summary of Income and Expenses) (Details) $ in Thousands	12 Months Ended
	Aug. 31, 2020 USD ($)
Leases [Abstract]
Operating lease cost	$ 114,290
Finance lease cost
Amortization of leased assets	5,470
Interest on lease liabilities	4,950
Other	15,038
Net lease cost	$ 139,748