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Goodwill, Service Contracts and Other Assets - Information Regarding Service Contracts and Other Assets (Details) - USD ($) $ in Thousands | Feb. 29, 2016 | May. 31, 2015
--- | --- | ---
Information regarding service contracts and other assets |  |
Service contracts, net | $ 86,380 | $ 42,434
Other assets, carrying amount | 68,042 | 65,423
Other assets, accumulated amortization | 49,757 | 47,929
Other assets, net | 18,285 | 17,494
Noncompete and consulting agreements |  |
Information regarding service contracts and other assets |  |
Other assets, carrying amount | 42,321 | 41,828
Other assets, accumulated amortization | 40,754 | 40,379
Other assets, net | 1,567 | 1,449
Other |  |
Information regarding service contracts and other assets |  |
Other assets, carrying amount | 25,721 | 23,595
Other assets, accumulated amortization | 9,003 | 7,550
Other assets, net | 16,718 | 16,045
Service Contracts |  |
Information regarding service contracts and other assets |  |
Service contracts, carrying amount | 394,326 | 340,816
Service contracts, accumulated amortization | 307,946 | 298,382
Service contracts, net | $ 86,380 | $ 42,434

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