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Notes Payable and Long-Term Debt (Amounts Outstanding) (Details) - USD ($)
6 Months Ended
Feb. 28, 2021
Aug. 31, 2020
Debt Instrument [Line Items]    
Long-term debt $ 2,730,016,000 $ 2,728,482,000
Less current installments of notes payable and long-term debt 50,197,000 50,194,000
Notes payable and long-term debt, less current installments $ 2,679,819,000 2,678,288,000
Senior Notes | 4.700% Senior Notes    
Debt Instrument [Line Items]    
Senior notes, stated interest rate (as a percent) 4.70%  
Long-term debt $ 498,983,000 498,659,000
Senior Notes | 4.900% Senior Notes    
Debt Instrument [Line Items]    
Senior notes, stated interest rate (as a percent) 4.90%  
Long-term debt $ 299,420,000 299,300,000
Senior Notes | 3.950% Senior Notes    
Debt Instrument [Line Items]    
Senior notes, stated interest rate (as a percent) 3.95%  
Long-term debt $ 495,745,000 495,440,000
Senior Notes | 3.600% Senior Notes    
Debt Instrument [Line Items]    
Senior notes, stated interest rate (as a percent) 3.60%  
Long-term debt $ 495,032,000 494,756,000
Senior Notes | 3.000% Senior Notes    
Debt Instrument [Line Items]    
Senior notes, stated interest rate (as a percent) 3.00%  
Long-term debt $ 590,708,000 590,162,000
Line of Credit | Revolving Credit Facility    
Debt Instrument [Line Items]    
Long-term debt 0 0
Unused borrowing capacity $ 3,800,000,000  
Debt term 5 years  
Line of Credit | Term Loan Facility    
Debt Instrument [Line Items]    
Long-term debt $ 350,128,000 $ 350,165,000
Line of Credit | Commercial Paper    
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 1,800,000,000