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Notes Payable, Long-Term Debt and Capital Lease Obligations - Amounts Outstanding (Details)
3 Months Ended 6 Months Ended
Nov. 08, 2017
USD ($)
extension_option
Feb. 28, 2018
USD ($)
Feb. 28, 2018
USD ($)
Aug. 31, 2017
USD ($)
Debt Instrument [Line Items]        
Capital lease obligations   $ 27,451,000 $ 27,451,000 $ 27,818,000
Total notes payable, long-term debt and capital lease obligations   2,208,636,000 2,208,636,000 2,078,090,000
Less current installments of notes payable, long-term debt and capital lease obligations   27,158,000 27,158,000 445,498,000
Notes payable, long-term debt and capital lease obligations, less current installments   $ 2,181,478,000 $ 2,181,478,000 1,632,592,000
Senior Notes | 8.250% Senior Notes        
Debt Instrument [Line Items]        
Senior Notes, stated interest rate   8.25% 8.25%  
Long-term debt   $ 0 $ 0 399,506,000
Redemption of debt outstanding   $ 400,000,000    
Senior Notes | 5.625% Senior Notes        
Debt Instrument [Line Items]        
Senior Notes, stated interest rate   5.625% 5.625%  
Long-term debt   $ 397,549,000 $ 397,549,000 397,104,000
Senior Notes | 4.700% Senior Notes        
Debt Instrument [Line Items]        
Senior Notes, stated interest rate   4.70% 4.70%  
Long-term debt   $ 497,023,000 $ 497,023,000 496,696,000
Senior Notes | 4.900% Senior Notes        
Debt Instrument [Line Items]        
Senior Notes, stated interest rate   4.90% 4.90%  
Long-term debt   $ 298,693,000 $ 298,693,000 298,571,000
Senior Notes | 3.950% Senior Notes        
Debt Instrument [Line Items]        
Senior Notes, stated interest rate   3.95% 3.95%  
Long-term debt   $ 493,915,000 $ 493,915,000 0
Debt issuance   500,000,000 500,000,000  
Revolving Credit Facility | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Long-term debt   0 0 0
Credit agreement term 5 years      
Maximum borrowing capacity $ 1,800,000,000      
Revolving credit facility, accordion feature, increase limit $ 2,300,000,000      
Number of extension options | extension_option 2      
Extension term, maximum 1 year      
Unused borrowing capacity   $ 2,200,000,000 $ 2,200,000,000  
Revolving Credit Facility | Minimum | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Interest rate on debt instrument   2.40% 2.40%  
Revolving Credit Facility | Maximum | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Interest rate on debt instrument   4.40% 4.40%  
Term Loan Facility | Line of Credit | Term Loan Facility        
Debt Instrument [Line Items]        
Long-term debt   $ 494,005,000 $ 494,005,000 $ 458,395,000
Maximum borrowing capacity $ 500,000,000      
Term Loan Facility | Minimum | Line of Credit | Term Loan Facility        
Debt Instrument [Line Items]        
Interest rate on debt instrument   2.60% 2.60%  
Term Loan Facility | Maximum | Line of Credit | Term Loan Facility        
Debt Instrument [Line Items]        
Interest rate on debt instrument   2.90% 2.90%  
Base Rate | Revolving Credit Facility | Minimum | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Interest rate above base rate     0.00%  
Base Rate | Revolving Credit Facility | Maximum | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Interest rate above base rate     0.575%  
Base Rate | Term Loan Facility | Minimum | Line of Credit | Term Loan Facility        
Debt Instrument [Line Items]        
Interest rate above base rate     0.125%  
Base Rate | Term Loan Facility | Maximum | Line of Credit | Term Loan Facility        
Debt Instrument [Line Items]        
Interest rate above base rate     0.875%  
Eurodollar | Revolving Credit Facility | Minimum | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Interest rate above base rate     0.975%  
Eurodollar | Revolving Credit Facility | Maximum | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Interest rate above base rate     1.575%  
Eurodollar | Term Loan Facility | Minimum | Line of Credit | Term Loan Facility        
Debt Instrument [Line Items]        
Interest rate above base rate     1.125%  
Eurodollar | Term Loan Facility | Maximum | Line of Credit | Term Loan Facility        
Debt Instrument [Line Items]        
Interest rate above base rate     1.875%  
Federal Funds Effective Swap Rate | Revolving Credit Facility | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Interest rate above base rate     0.50%  
London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Interest rate above base rate     1.00%