Leases (Supplemental Cash Flow Information) (Details) $ in Thousands	9 Months Ended
	May 31, 2020 USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$ 83,427
Operating cash flows for finance leases	3,693
Financing activities for finance leases	4,451
Non-cash right-of-use assets obtained in exchange for new lease liabilities:
Operating leases	82,552
Finance leases	$ 111,591