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Fair Value Measurements (Fair Value of Financial Instruments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2020
Jul. 13, 2020
Jan. 15, 2020
Aug. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Document Period End Date Aug. 31, 2020      
Notes payable and long-term debt $ 2,728,482     $ 2,496,465
Senior Notes | 5.625% Senior Notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Senior notes, stated interest rate (as a percent) 5.625% 5.625%    
Notes payable and long-term debt $ 0     398,886
Senior Notes | 5.625% Senior Notes | Level 2 | Carrying Amount        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable and long-term debt 0     398,886
Senior Notes | 5.625% Senior Notes | Level 2 | Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable and long-term debt $ 0     416,000
Senior Notes | 4.700% Senior Notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Senior notes, stated interest rate (as a percent) 4.70%      
Notes payable and long-term debt $ 498,659     498,004
Senior Notes | 4.700% Senior Notes | Level 2 | Carrying Amount        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable and long-term debt 498,659     498,004
Senior Notes | 4.700% Senior Notes | Level 2 | Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable and long-term debt $ 537,180     525,890
Senior Notes | 4.900% Senior Notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Senior notes, stated interest rate (as a percent) 4.90%      
Notes payable and long-term debt $ 299,300     299,057
Senior Notes | 4.900% Senior Notes | Level 3 | Carrying Amount        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable and long-term debt 299,300     299,057
Senior Notes | 4.900% Senior Notes | Level 3 | Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable and long-term debt $ 329,435     318,704
Senior Notes | 3.950% Senior Notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Senior notes, stated interest rate (as a percent) 3.95%      
Notes payable and long-term debt $ 495,440     494,825
Senior Notes | 3.950% Senior Notes | Level 2 | Carrying Amount        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable and long-term debt 495,440     494,825
Senior Notes | 3.950% Senior Notes | Level 2 | Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable and long-term debt $ 551,930     509,845
Senior Notes | 3.600% Senior Notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Senior notes, stated interest rate (as a percent) 3.60%   3.60%  
Notes payable and long-term debt $ 494,756     0
Senior Notes | 3.600% Senior Notes | Level 2 | Carrying Amount        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable and long-term debt 494,756     0
Senior Notes | 3.600% Senior Notes | Level 2 | Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable and long-term debt $ 536,110     0
Senior Notes | 3.000% Senior Notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Senior notes, stated interest rate (as a percent) 3.00% 3.00%    
Notes payable and long-term debt $ 590,162     0
Senior Notes | 3.000% Senior Notes | Level 2 | Carrying Amount        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable and long-term debt 590,162     0
Senior Notes | 3.000% Senior Notes | Level 2 | Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable and long-term debt $ 611,616     $ 0