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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($)
12 Months Ended
May 31, 2016
May 31, 2015
May 31, 2014
Goodwill [Line Items]      
Accumulated impairment loss $ 0 $ 0 $ 0
Amortization expense of acquired intangibles $ 113,689,000 $ 72,587,000 $ 61,945,000
Customer-related intangible assets      
Goodwill [Line Items]      
Intangible assets weighted average amortization periods 13 years 10 months 24 days 15 years 1 month 6 days  
Acquired technology      
Goodwill [Line Items]      
Intangible assets weighted average amortization periods 5 years 9 years 1 month 6 days  
Trademarks and trade names      
Goodwill [Line Items]      
Intangible assets weighted average amortization periods 7 years 6 years 1 month 6 days