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Goodwill and Intangible Assets - Goodwill Rollforward (Details) - USD ($)
$ in Thousands
 12 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2013
Goodwill [Roll Forward]      
Goodwill, gross $ 1,491,833 $ 1,337,285 $ 1,044,222
Accumulated impairment losses 0 0 0
Goodwill, balance at beginning of period 1,337,285 1,044,222  
Goodwill acquired 264,239 271,577  
Effect of foreign currency translation (109,691) 21,486  
Goodwill, balance at end of period 1,491,833 1,337,285  
North America      
Goodwill [Roll Forward]      
Goodwill, gross 779,734 786,655 519,175
Accumulated impairment losses 0 0 0
Goodwill, balance at beginning of period 786,655 519,175  
Goodwill acquired 4,794 271,577  
Effect of foreign currency translation (11,715) (4,097)  
Goodwill, balance at end of period 779,734 786,655  
Europe Segment [Member]      
Goodwill [Roll Forward]      
Goodwill, gross 485,921 491,038 464,769
Accumulated impairment losses 0 0 0
Goodwill, balance at beginning of period 491,038 464,769  
Goodwill acquired 67,220 0  
Effect of foreign currency translation (72,337) 26,269  
Goodwill, balance at end of period 485,921 491,038  
Asia Pacific Segment [Member]      
Goodwill [Roll Forward]      
Goodwill, gross 226,178 59,592 60,278
Accumulated impairment losses 0 0 $ 0
Goodwill, balance at beginning of period 59,592 60,278  
Goodwill acquired 192,225 0  
Effect of foreign currency translation (25,639) (686)  
Goodwill, balance at end of period $ 226,178 $ 59,592