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Notes Payable, Long-Term Debt and Capital Lease Obligations - Amounts Outstanding (Details)
3 Months Ended 9 Months Ended
Nov. 08, 2017
USD ($)
extension_option
Feb. 28, 2018
USD ($)
May 31, 2018
USD ($)
Aug. 31, 2017
USD ($)
Debt Instrument [Line Items]        
Capital lease obligations     $ 26,813,000 $ 27,818,000
Total notes payable, long-term debt and capital lease obligations     2,448,633,000 2,078,090,000
Less current installments of notes payable, long-term debt and capital lease obligations     273,500,000 445,498,000
Notes payable, long-term debt and capital lease obligations, less current installments     $ 2,175,133,000 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     $ 0 399,506,000
Redemption of debt outstanding   $ 400,000,000    
Senior Notes | 5.625% Senior Notes        
Debt Instrument [Line Items]        
Senior Notes, stated interest rate     5.625%  
Long-term debt     $ 397,772,000 397,104,000
Senior Notes | 4.700% Senior Notes        
Debt Instrument [Line Items]        
Senior Notes, stated interest rate     4.70%  
Long-term debt     $ 497,187,000 496,696,000
Senior Notes | 4.900% Senior Notes        
Debt Instrument [Line Items]        
Senior Notes, stated interest rate     4.90%  
Long-term debt     $ 298,753,000 298,571,000
Senior Notes | 3.950% Senior Notes        
Debt Instrument [Line Items]        
Senior Notes, stated interest rate   3.95% 3.95%  
Long-term debt     $ 494,092,000 0
Debt issuance   $ 500,000,000    
Revolving Credit Facility | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Long-term debt     247,000,000 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     $ 1,900,000,000  
Revolving Credit Facility | Minimum | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Interest rate on debt instrument     2.40%  
Revolving Credit Facility | Maximum | Line of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Interest rate on debt instrument     4.40%  
Term Loan Facility | Line of Credit | Term Loan Facility        
Debt Instrument [Line Items]        
Long-term debt     $ 487,016,000 $ 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%  
Term Loan Facility | Maximum | Line of Credit | Term Loan Facility        
Debt Instrument [Line Items]        
Interest rate on debt instrument     3.30%  
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%