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Notes Payable and Long-Term Debt - Amounts Outstanding (Details) - USD ($)
$ in Thousands
May 31, 2019
Aug. 31, 2018
Debt Instrument [Line Items]    
Long-term debt $ 2,931,672 $ 2,518,699
Less current installments of notes payable and long-term debt 454,830 25,197
Notes payable and long-term debt, less current installments $ 2,476,842 2,493,502
Senior Notes | 5.625% Senior Notes    
Debt Instrument [Line Items]    
Senior Notes, stated interest rate 5.625%  
Long-term debt $ 398,663 397,995
Senior Notes | 4.700% Senior Notes    
Debt Instrument [Line Items]    
Senior Notes, stated interest rate 4.70%  
Long-term debt $ 497,841 497,350
Senior Notes | 4.900% Senior Notes    
Debt Instrument [Line Items]    
Senior Notes, stated interest rate 4.90%  
Long-term debt $ 298,996 298,814
Senior Notes | 3.950% Senior Notes    
Debt Instrument [Line Items]    
Senior Notes, stated interest rate 3.95%  
Long-term debt $ 494,670 494,208
Revolving Credit Facility | Line of Credit | Revolving Credit Facility    
Debt Instrument [Line Items]    
Long-term debt 429,648 0
Unused borrowing capacity 2,000,000  
Term Loan Facility | Line of Credit | Term Loan Facility    
Debt Instrument [Line Items]    
Long-term debt $ 811,854 $ 830,332