Leases (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Nov. 30, 2019	Aug. 31, 2019	Aug. 31, 2018	Aug. 31, 2017	Sep. 01, 2019
Leases [Abstract]
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation		$ 0	$ 0
Operating Leases, Rent Expense, Net		0	0	$ 0
Cumulative Effect of New Accounting Principle in Period of Adoption					$ 33,700
Finance Lease, Liability, Payments, Remainder of Fiscal Year	$ 4,790
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	45,821
Capital Leases, Future Minimum Payments Due, Next Twelve Months		6,761
Operating Leases, Future Minimum Payments Due, Next Twelve Months		87,168
Operating Lease, Payments	15,722
Operating Lease, Right-of-Use Asset	259,028				268,400
Operating Lease, Expense	16,480
Finance Lease, Right-of-Use Asset, Amortization	2,189
Finance Lease, Interest Expense	224
Short-term Lease, Cost	3,343
Variable Lease, Cost	116
Lease, Cost	22,352
Operating Lease, Liability	258,173				$ 267,000
Finance Lease, Right-of-Use Asset	40,536
Finance Lease, Liability, Current	6,049
Operating Lease, Liability, Current	53,868
Finance Lease, Liability, Noncurrent	21,092
Finance Lease, Liability	$ 27,141
Operating Lease, Weighted Average Remaining Lease Term	8 years 5 months
Finance Lease, Weighted Average Remaining Lease Term	6 years 3 months
Operating Lease, Weighted Average Discount Rate, Percent	3.13%
Finance Lease, Weighted Average Discount Rate, Percent	3.34%
Finance Lease, Interest Payment on Liability	$ 224
Finance Lease, Principal Payments	1,673
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	4,724
Capital Leases, Future Minimum Payments Due in Two Years		6,199
Operating Leases, Future Minimum Payments, Due in Two Years		57,381
Capital Leases, Future Minimum Payments Due in Three Years		5,021
Operating Leases, Future Minimum Payments, Due in Three Years		43,665
Capital Leases, Future Minimum Payments Due in Four Years		4,548
Operating Leases, Future Minimum Payments, Due in Four Years		34,328
Capital Leases, Future Minimum Payments Due in Five Years		2,638
Operating Leases, Future Minimum Payments, Due in Five Years		26,793
Capital Leases, Future Minimum Payments Due Thereafter		6,517
Operating Leases, Future Minimum Payments, Due Thereafter		92,653
Capital Leases, Future Minimum Payments, Net Minimum Payments		31,684
Operating Leases, Future Minimum Payments Due		341,988
Capital Leases, Future Minimum Payments, Interest Included in Payments		3,445
Capital Lease Obligations		28,239
Finance Lease, Liability, Payments, Due Next Twelve Months	6,190
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	53,054
Finance Lease, Liability, Payments, Due Year Two	5,045
Lessee, Operating Lease, Liability, Payments, Due Year Two	40,159
Finance Lease, Liability, Payments, Due Year Three	4,452
Lessee, Operating Lease, Liability, Payments, Due Year Three	31,851
Finance Lease, Liability, Payments, Due Year Four	2,685
Lessee, Operating Lease, Liability, Payments, Due Year Four	24,958
Finance Lease, Liability, Payments, Due Year Five	7,228
Lessee, Operating Lease, Liability, Payments, Due Year Five	105,730
Finance Lease, Liability, Payment, Due	30,390
Lessee, Operating Lease, Liability, Payments, Due	301,573
Finance Lease, Liability, Undiscounted Excess Amount	3,249
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	43,400
Operating Lease, Liability, Noncurrent	$ 204,305
Capital Leased Assets, Gross		$ 0	$ 0