Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
May 31, 2021
May 31, 2020
May 31, 2021
May 31, 2020
Aug. 31, 2020
Leases [Abstract]          
Finance Lease, Liability, Payments, Remainder of Fiscal Year $ 2,004   $ 2,004    
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year 18,002   18,002    
Operating Lease, Payments     56,448 $ 45,718  
Operating Lease, Right-of-Use Asset 262,737   262,737   $ 257,834
Operating Lease, Expense 18,534 $ 17,057 54,508 53,155  
Finance Lease, Right-of-Use Asset, Amortization 1,974 1,908 5,919 5,170  
Finance Lease, Interest Expense 218 257 694 742  
Short-term Lease, Cost 3,970 3,108 12,394 12,768  
Variable Lease, Cost 668 1,176 2,209 2,089  
Lease, Cost 25,364 $ 23,506 75,724 73,924  
Operating Lease, Liability 266,280   266,280   260,891
Finance Lease, Right-of-Use Asset 39,393   39,393   44,860
Finance Lease, Liability, Current 7,152   7,152   7,993
Operating Lease, Liability, Current 58,767   58,767   57,200
Finance Lease, Liability, Noncurrent 19,307   19,307   23,467
Finance Lease, Liability $ 26,459   $ 26,459   $ 31,460
Operating Lease, Weighted Average Remaining Lease Term 7 years 10 months 24 days   7 years 10 months 24 days   8 years 3 months 18 days
Finance Lease, Weighted Average Remaining Lease Term 5 years 8 months 12 days   5 years 8 months 12 days   6 years
Operating Lease, Weighted Average Discount Rate, Percent 2.99%   2.99%   3.11%
Finance Lease, Weighted Average Discount Rate, Percent 3.34%   3.34%   3.33%
Finance Lease, Interest Payment on Liability     $ 694 742  
Finance Lease, Principal Payments     6,426 5,239  
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability     37,284 32,567  
Finance Lease, Liability, Payments, Due Next Twelve Months $ 7,787   7,787    
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months 65,469   65,469    
Finance Lease, Liability, Payments, Due Year Two 6,206   6,206    
Lessee, Operating Lease, Liability, Payments, Due Year Two 51,946   51,946    
Finance Lease, Liability, Payments, Due Year Three 3,487   3,487    
Lessee, Operating Lease, Liability, Payments, Due Year Three 41,945   41,945    
Finance Lease, Liability, Payments, Due Year Four 2,078   2,078    
Lessee, Operating Lease, Liability, Payments, Due Year Four 31,211   31,211    
Finance Lease, Liability, Payments, Due Year Five 8,071   8,071    
Lessee, Operating Lease, Liability, Payments, Due Year Five 108,601   108,601    
Finance Lease, Liability, Payment, Due 29,633   29,633    
Lessee, Operating Lease, Liability, Payments, Due 317,174   317,174    
Finance Lease, Liability, Undiscounted Excess Amount 3,174   3,174    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount 50,894   50,894    
Operating Lease, Liability, Noncurrent $ 207,513   207,513   $ 203,691
Right of use asset modification     $ 23,886 $ 6,507