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Long-Term Debt (Details)
Aug. 31, 2016
USD ($)
Jul. 31, 2016
USD ($)
Apr. 30, 2016
USD ($)
Jul. 31, 2015
USD ($)
Debt Instrument [Line Items]        
Long-term debt   $ 1,492,654,000 $ 1,492,201,000 $ 502,759,000
Less: Current portion   (864,000) (826,000) (799,000)
Long-term debt excluding current portion   1,491,790,000 1,491,375,000 501,960,000
Maximum borrowing capacity   1,300,000,000    
Subsequent Event [Member]        
Debt Instrument [Line Items]        
Long-term Line of Credit, Noncurrent $ 50,000,000      
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity   2,000,000,000    
Available increase in borrowing capacity   $ 500,000,000.0    
Maximum quarterly debt-to-EBITDA ratio   3.50    
Maximum annual debt-to-EBITDA ratio   4.50    
Minimum interest coverage ratio   2.50    
Swingline Loans [Member]        
Debt Instrument [Line Items]        
Maximum borrowing capacity   $ 200,000,000.0    
Standby Letters of Credit [Member]        
Debt Instrument [Line Items]        
Maximum borrowing capacity   100,000,000.0    
Capital Lease Obligations [Member]        
Debt Instrument [Line Items]        
Long-term debt   7,229,000 7,435,000 8,031,000
Unamortized Debt Issuance Expense   (14,575,000) (15,234,000) (5,272,000)
Senior Notes due 2020 [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Long-term debt   650,000,000 650,000,000  
Senior Notes due 2022 [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Long-term debt   500,000,000 500,000,000 $ 500,000,000
Senior Notes due 2025 [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Long-term debt   $ 350,000,000 $ 350,000,000