Leases (Summary of Income and Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Feb. 29, 2020	Feb. 29, 2020
Leases [Abstract]
Operating lease cost	$ 27,810	$ 55,546
Finance lease cost
Amortization of leased assets	1,445	2,581
Interest on lease liabilities	1,254	2,443
Other	1,655	4,183
Net lease cost	$ 32,164	$ 64,753