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Fair Value Measurements (Fair Value of Financial Instruments) (Details) - USD ($)
$ in Thousands
Feb. 28, 2021
Aug. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes payable and long-term debt $ 2,730,016 $ 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 $ 498,983 498,659
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 498,983 498,659
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 $ 531,245 537,180
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 $ 299,420 299,300
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 299,420 299,300
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 $ 327,954 329,435
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 $ 495,745 495,440
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 495,745 495,440
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 $ 561,425 551,930
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 $ 495,032 494,756
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 495,032 494,756
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 $ 535,905 536,110
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 $ 590,708 590,162
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 590,708 590,162
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 $ 612,480 $ 611,616