Leases (Summary of Income and Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	May 31, 2020	May 31, 2020
Leases [Abstract]
Operating lease cost	$ 28,472	$ 84,018
Finance lease cost
Amortization of leased assets	1,445	4,026
Interest on lease liabilities	1,250	3,693
Other	3,526	7,709
Net lease cost	$ 34,693	$ 99,446