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Goodwill and Other Intangible Assets - Schedule of Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
Nov. 30, 2015
May. 31, 2015
Finite-Lived Intangible Assets [Line Items]    
Goodwill $ 1,577,455 $ 1,491,833
Other intangible assets 1,089,470 952,856
Less accumulated amortization 423,803 392,720
Other intangible assets, net 665,667 560,136
Customer-related intangible assets    
Finite-Lived Intangible Assets [Line Items]    
Other intangible assets 859,745 718,011
Less accumulated amortization 365,507 342,488
Contract-based intangible assets    
Finite-Lived Intangible Assets [Line Items]    
Other intangible assets 129,399 130,874
Less accumulated amortization 40,658 37,286
Acquired technologies    
Finite-Lived Intangible Assets [Line Items]    
Other intangible assets 90,378 93,194
Less accumulated amortization 12,716 8,509
Trademarks and trade names    
Finite-Lived Intangible Assets [Line Items]    
Other intangible assets 9,948 10,777
Less accumulated amortization $ 4,922 $ 4,437