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GOODWILL AND INTANGIBLE ASSETS - Goodwill Rollforward (Details) - USD ($)
$ in Thousands
 12 Months Ended
May 31, 2016
May 31, 2015
Goodwill [Roll Forward]    
Goodwill, balance at beginning of period $ 1,491,833 $ 1,337,285
Goodwill acquired 3,372,170 264,239
Effect of foreign currency translation (33,006) (109,691)
Measurement-period adjustments (1,592)  
Goodwill, balance at end of period 4,829,405 1,491,833
North America    
Goodwill [Roll Forward]    
Goodwill, balance at beginning of period 779,734 786,655
Goodwill acquired 3,318,768 4,794
Effect of foreign currency translation (3,872) (11,715)
Measurement-period adjustments (8,200)  
Goodwill, balance at end of period 4,086,430 779,734
Europe    
Goodwill [Roll Forward]    
Goodwill, balance at beginning of period 485,921 491,038
Goodwill acquired 0 67,220
Effect of foreign currency translation (13,737) (72,337)
Measurement-period adjustments (411)  
Goodwill, balance at end of period 471,773 485,921
Asia-Pacific    
Goodwill [Roll Forward]    
Goodwill, balance at beginning of period 226,178 59,592
Goodwill acquired 53,402 192,225
Effect of foreign currency translation (15,397) (25,639)
Measurement-period adjustments 7,019  
Goodwill, balance at end of period $ 271,202 $ 226,178