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Long-Term Debt and Credit Facilities - Schedule of outstanding debt (Details) - USD ($)
Nov. 30, 2015
Jul. 31, 2015
May. 31, 2015
Debt Instrument [Line Items]      
Long-term Debt $ 1,915,803,000   $ 1,740,067,000
Less current portion of long-term debt ($62,500 face amount less unamortized debt issuance costs of $716 at May 31, 2015) 0   61,784,000
Long-term debt 1,915,803,000   1,678,283,000
Debt instrument, face amount 0   62,500,000.0
Unamortized debt issuance expense 0   716,000
Term loan      
Debt Instrument [Line Items]      
Long-term Debt 1,745,303,000   1,231,942,000
Unamortized debt issuance expense 4,900,000    
Line of credit      
Debt Instrument [Line Items]      
Long-term Debt 170,500,000   508,125,000
Five Year Unsecured Term Loan Due February 2019 | Term loan      
Debt Instrument [Line Items]      
Debt instrument, face amount 1,750,000,000 $ 1,750,000,000 1,234,375,000
Unamortized debt issuance expense $ 4,697,000   $ 2,433,000