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Fair Value Measurements (Fair Value of Financial Instruments) (Details) - USD ($)
$ in Thousands
Nov. 30, 2020
Aug. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes payable and long-term debt $ 2,729,200 $ 2,728,482
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 $ 498,823 498,659
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 498,823 498,659
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 $ 535,080 537,180
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 $ 299,361 299,300
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 299,361 299,300
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 $ 328,810 329,435
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 $ 495,594 495,440
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 495,594 495,440
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 $ 561,005 551,930
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%  
Notes payable and long-term debt $ 494,896 494,756
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 494,896 494,756
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 $ 553,710 536,110
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%  
Notes payable and long-term debt $ 590,400 590,162
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 590,400 590,162
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 $ 629,262 $ 611,616