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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

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