Leases, Codification Topic 842 (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2018	Aug. 31, 2017	Sep. 01, 2019
Leases [Abstract]
Finance Lease, Liability, Payments, Due Next Twelve Months	$ 8,845
Finance Lease, Liability, Payments, Due Year Two	7,017
Finance Lease, Liability, Payments, Due Year Three	6,053
Finance Lease, Liability, Payments, Due Year Four	3,443
Finance Lease, Liability, Payments, Due Year Five	2,046
Finance Lease, Liability, Payments, Due after Year Five	7,933
Finance Lease, Liability, Payment, Due	35,337
Finance Lease, Liability, Undiscounted Excess Amount	3,877
Finance Lease, Liability	31,460
Finance Lease, Liability, Current	7,993
Finance Lease, Liability, Noncurrent	23,467
Operating Leases, Future Minimum Payments, Next Rolling Twelve Months	64,379
Operating Leases, Future Minimum Payments Receivable, in Four Years	32,195
Operating Leases, Future Minimum Payments Receivable, in Five Years	23,034
Operating Leases, Future Minimum Payments Receivable, Thereafter	95,553
Lessee, Operating Lease, Liability, Payments, Due	305,828
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	44,937
Operating Lease, Right-of-Use Asset	257,834				$ 268,400
Accumulated amortization on assets under capital leases		$ 20,600	$ 18,900
Assets under capital leases		62,700	50,000
Operating leases, rent expense, net		113,300	$ 88,500	$ 81,300
CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption					25,300
Operating Lease, Expense	71,541
Finance Lease, Right-of-Use Asset, Amortization	8,205
Finance Lease, Interest Expense	1,060
Short-term Lease, Cost	15,991
Variable Lease, Cost	3,674
Lease, Cost	100,471
Finance Lease, Right-of-Use Asset	$ 44,860
Operating Lease, Weighted Average Remaining Lease Term	8 years 3 months 18 days
Finance Lease, Weighted Average Remaining Lease Term	6 years
Operating Lease, Weighted Average Discount Rate, Percent	3.11%
Finance Lease, Weighted Average Discount Rate, Percent	3.33%
Operating Lease, Payments	$ 71,003
Finance Lease, Interest Payment on Liability	1,060
Finance Lease, Principal Payments	7,949
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	56,461
Right of Use Asset Modification	7,333
Capital Leases, Future Minimum Payments Due, Next Twelve Months		6,761
Capital Leases, Future Minimum Payments Due in Two Years		6,199
Capital Leases, Future Minimum Payments Due in Three Years		5,021
Capital Leases, Future Minimum Payments Due in Four Years		4,548
Capital Leases, Future Minimum Payments Due in Five Years		2,638
Capital Leases, Future Minimum Payments Due Thereafter		6,517
Capital Leases, Future Minimum Payments, Net Minimum Payments		31,684
Capital Leases, Future Minimum Payments, Interest Included in Payments		3,445
Capital Lease Obligations	31,460	28,239
2020		87,168
2021	50,398	57,381
2022	40,269	43,665
2023		34,328
2024		26,793
Operating Leases, Future Minimum Payments, Due Thereafter		92,653
Operating Leases, Future Minimum Payments Due		$ 341,988
Other liabilities
Leases [Abstract]
Operating Lease, Liability					267,000
Lessee, Lease, Description [Line Items]
Operating Lease, Liability					267,000
Other liabilities
Leases [Abstract]
Operating Lease, Liability					267,000
Operating Lease, Liability, Noncurrent	203,691
Lessee, Lease, Description [Line Items]
Operating Lease, Liability, Noncurrent	203,691
Operating Lease, Liability					$ 267,000
Accrued Liabilities [Member]
Leases [Abstract]
Operating Lease, Liability, Current	57,200
Lessee, Lease, Description [Line Items]
Operating Lease, Liability, Current	57,200
Liabilities, Total
Leases [Abstract]
Operating Lease, Liability	260,891
Lessee, Lease, Description [Line Items]
Operating Lease, Liability	$ 260,891