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Debt and Lines of Credit - Lines of Credit (Details)
Jun. 29, 2018
USD ($)
Aug. 31, 2019
USD ($)
Aug. 31, 2018
USD ($)
Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Outstanding letters of credit   $ 3,800,000  
Lines of Credit      
Line of Credit Facility [Line Items]      
Revolving credit facility $ 800,000,000    
Minimum interest coverage ratio 2.50    
Maximum leverage ratio 3.50    
Outstanding letters of credit   8,000,000.0  
Lines of Credit | Minimum      
Line of Credit Facility [Line Items]      
Commitment fees rate 0.125%    
Lines of Credit | Maximum      
Line of Credit Facility [Line Items]      
Commitment fees rate 0.25%    
Lines of Credit | New Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Term of notes 5 years    
Revolving credit facility $ 400,000,000.0    
Borrowings outstanding under credit facility   0 $ 0
Lines of Credit | Unsecured Delayed Draw Term Loan      
Line of Credit Facility [Line Items]      
Revolving credit facility $ 400,000,000.0    
Lines of Credit | Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Additional borrowing capacity under revolving credit facility   $ 796,200,000  
Eurocurrency Rate | Lines of Credit | New Revolving Credit Facility | Minimum      
Line of Credit Facility [Line Items]      
Applicable margins as determined by leverage ratio 1.00%    
Eurocurrency Rate | Lines of Credit | New Revolving Credit Facility | Maximum      
Line of Credit Facility [Line Items]      
Applicable margins as determined by leverage ratio 1.375%    
Eurocurrency Rate | Lines of Credit | Unsecured Delayed Draw Term Loan | Minimum      
Line of Credit Facility [Line Items]      
Applicable margins as determined by leverage ratio 0.875%    
Eurocurrency Rate | Lines of Credit | Unsecured Delayed Draw Term Loan | Maximum      
Line of Credit Facility [Line Items]      
Applicable margins as determined by leverage ratio 1.25%    
Base Rate | Lines of Credit | New Revolving Credit Facility | Minimum      
Line of Credit Facility [Line Items]      
Applicable margins as determined by leverage ratio 0.00%    
Base Rate | Lines of Credit | New Revolving Credit Facility | Maximum      
Line of Credit Facility [Line Items]      
Applicable margins as determined by leverage ratio 0.375%    
Base Rate | Lines of Credit | Unsecured Delayed Draw Term Loan | Minimum      
Line of Credit Facility [Line Items]      
Applicable margins as determined by leverage ratio 0.00%    
Base Rate | Lines of Credit | Unsecured Delayed Draw Term Loan | Maximum      
Line of Credit Facility [Line Items]      
Applicable margins as determined by leverage ratio 0.25%    
Year one | Lines of Credit | Unsecured Delayed Draw Term Loan      
Line of Credit Facility [Line Items]      
Periodic payment maturity as percent of principal (percent) 2.50%    
Year two | Lines of Credit | Unsecured Delayed Draw Term Loan      
Line of Credit Facility [Line Items]      
Periodic payment maturity as percent of principal (percent) 2.50%    
Year three | Lines of Credit | Unsecured Delayed Draw Term Loan      
Line of Credit Facility [Line Items]      
Periodic payment maturity as percent of principal (percent) 5.00%    
Year four | Lines of Credit | Unsecured Delayed Draw Term Loan      
Line of Credit Facility [Line Items]      
Periodic payment maturity as percent of principal (percent) 5.00%    
Year five | Lines of Credit | Unsecured Delayed Draw Term Loan      
Line of Credit Facility [Line Items]      
Periodic payment maturity as percent of principal (percent) 7.50%