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LONG-TERM DEBT AND CREDIT FACILITIES - Schedule of outstanding debt (Details) - USD ($)
Feb. 29, 2016
Jul. 31, 2015
May. 31, 2015
Debt Instrument [Line Items]      
Long-term Debt $ 1,874,077,000   $ 1,740,067,000
Less current portion of long-term debt ($87,500 face amount less unamortized debt issuance cost of $1,098 at February 29, 2016, and $62,500 face amount less unamortized debt issuance costs of $716 at May 31, 2015) 86,402,000   61,784,000
Long-term debt 1,787,675,000   1,678,283,000
Debt instrument, face amount 87,500,000.0   62,500,000.0
Unamortized debt issuance expense 1,098,000   716,000
Term loan      
Debt Instrument [Line Items]      
Long-term Debt 1,745,577,000   1,231,942,000
Unamortized debt issuance expense   $ 4,900,000  
Line of credit      
Debt Instrument [Line Items]      
Long-term Debt 128,500,000   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 $ 1,750,000,000.00 1,234,375,000
Unamortized debt issuance expense $ 4,423,000   $ 2,433,000