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GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
Feb. 29, 2016
May. 31, 2015
Finite-Lived Intangible Assets [Line Items]    
Goodwill $ 1,556,904 $ 1,491,833
Other intangible assets:    
Other intangible assets 1,084,459 952,856
Less accumulated amortization:    
Less accumulated amortization 438,918 392,720
Other intangible assets, net 645,541 560,136
Customer-related intangible assets    
Other intangible assets:    
Other intangible assets 850,629 718,011
Less accumulated amortization:    
Less accumulated amortization 375,572 342,488
Contract-based intangible assets    
Other intangible assets:    
Other intangible assets 130,356 130,874
Less accumulated amortization:    
Less accumulated amortization 43,019 37,286
Acquired technologies    
Other intangible assets:    
Other intangible assets 91,107 93,194
Less accumulated amortization:    
Less accumulated amortization 15,161 8,509
Trademarks and trade names    
Other intangible assets:    
Other intangible assets 12,367 10,777
Less accumulated amortization:    
Less accumulated amortization $ 5,166 $ 4,437