Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2021	Feb. 29, 2020	Aug. 31, 2020
Leases [Abstract]
Finance Lease, Liability, Payments, Remainder of Fiscal Year	$ 3,775		$ 3,775
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	35,958		35,958
Operating Lease, Payments			37,460	$ 28,368
Operating Lease, Right-of-Use Asset	265,684		265,684		$ 257,834
Operating Lease, Expense	18,060	$ 20,538	35,974	36,098
Finance Lease, Right-of-Use Asset, Amortization	1,890	1,073	3,945	3,262
Finance Lease, Interest Expense	230	261	476	485
Short-term Lease, Cost	4,068	6,317	8,424	9,660
Variable Lease, Cost	863	710	1,541	913
Lease, Cost	25,111	$ 28,899	50,360	50,418
Operating Lease, Liability	269,206		269,206		260,891
Finance Lease, Right-of-Use Asset	40,502		40,502		44,860
Finance Lease, Liability, Current	6,827		6,827		7,993
Operating Lease, Liability, Current	58,766		58,766		57,200
Finance Lease, Liability, Noncurrent	20,379		20,379		23,467
Finance Lease, Liability	$ 27,206		$ 27,206		$ 31,460
Operating Lease, Weighted Average Remaining Lease Term	8 years 1 month 6 days		8 years 1 month 6 days		8 years 3 months 18 days
Finance Lease, Weighted Average Remaining Lease Term	6 years 2 months 12 days		6 years 2 months 12 days		6 years
Operating Lease, Weighted Average Discount Rate, Percent	3.05%		3.05%		3.11%
Finance Lease, Weighted Average Discount Rate, Percent	3.37%		3.37%		3.33%
Finance Lease, Interest Payment on Liability			$ 476	485
Finance Lease, Principal Payments			4,602	3,285
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability			27,919	18,162
Finance Lease, Liability, Payments, Due Next Twelve Months	$ 7,051		7,051
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	62,491		62,491
Finance Lease, Liability, Payments, Due Year Two	6,121		6,121
Lessee, Operating Lease, Liability, Payments, Due Year Two	48,834		48,834
Finance Lease, Liability, Payments, Due Year Three	3,494		3,494
Lessee, Operating Lease, Liability, Payments, Due Year Three	38,956		38,956
Finance Lease, Liability, Payments, Due Year Four	2,086		2,086
Lessee, Operating Lease, Liability, Payments, Due Year Four	28,928		28,928
Finance Lease, Liability, Payments, Due Year Five	8,113		8,113
Lessee, Operating Lease, Liability, Payments, Due Year Five	105,485		105,485
Finance Lease, Liability, Payment, Due	30,640		30,640
Lessee, Operating Lease, Liability, Payments, Due	320,652		320,652
Finance Lease, Liability, Undiscounted Excess Amount	3,434		3,434
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	51,446		51,446
Operating Lease, Liability, Noncurrent	$ 210,440		210,440		$ 203,691
Right of use asset modification			$ 18,038	$ 3,967