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LONG-TERM DEBT AND CREDIT FACILITIES - Schedule of outstanding debt (Details) - USD ($)
Aug. 31, 2016
May 31, 2016
Jul. 31, 2015
Debt Instrument [Line Items]      
Long-term Debt $ 4,471,678,000 $ 4,515,286,000  
Less current portion of long-term debt (face amounts of $192,300 and $145,938 at August 31, 2016 and May 31, 2016, respectively, less unamortized debt issuance costs of $10,327 and $10,442 at August 31, 2016 and May 31, 2016, respectively) and current portion of capital lease obligations of $39 and $46 at August 31, 2016 and May 31, 2016, respectively 182,012,000 135,542,000  
Long-term debt 4,289,666,000 4,379,744,000  
Debt instrument, face amount 192,300,000.0 145,900,000.0  
Unamortized debt issuance expense 10,327,000 10,442,000  
Current portion of capital lease obligation 39,000 46,000  
Term loan      
Debt Instrument [Line Items]      
Long-term Debt 3,479,132,000 3,478,230,000  
Line of credit      
Debt Instrument [Line Items]      
Long-term Debt 992,500,000 1,037,000,000  
Capital lease obligations      
Debt Instrument [Line Items]      
Capital lease obligations 46,000 56,000  
Five Year Unsecured Term Loan Due February 2019 | Term loan      
Debt Instrument [Line Items]      
Debt instrument, face amount 3,528,288,000 3,530,000,000 $ 1,750,000,000.00
Unamortized debt issuance expense $ 49,156,000 $ 51,770,000