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Long-Term Debt and Credit Facilities - Schedule of Outstanding Debt (Details) - USD ($)
May. 31, 2015
May. 31, 2014
Feb. 28, 2014
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 62,500,000.0 $ 17,677,000.000  
Term loan and corporate credit facility 1,740,067,000    
Total 1,742,500,000 1,390,507,000  
Current portion of long-term debt 61,784,000 16,938,000  
Long-term debt 1,678,283,000 1,373,569,000  
Unamortized Debt Issuance Expense 716,000 739,000  
Term loans      
Debt Instrument [Line Items]      
Term loan and corporate credit facility 1,231,942,000 1,246,828,000  
Notes Payable      
Debt Instrument [Line Items]      
Notes payable 0 3,679,000  
Five Year Unsecured Term Loan Due February 2019 | Term loans      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount 1,234,375,000 1,250,000,000 $ 1,250,000,000.00
Unamortized Debt Issuance Expense 2,433,000 3,172,000  
Corporate Credit Facility | Line of Credit      
Debt Instrument [Line Items]      
Term loan and corporate credit facility 508,125,000 140,000,000  
Accounts Payable and Accrued Liabilities | Interest Rate Swap      
Debt Instrument [Line Items]      
Derivative, Notional Amount $ 500,000,000 $ 500,000,000