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Goodwill, Service Contracts and Other Assets - Information Regarding Service Contracts and Other Assets (Details) - USD ($) $ in Thousands | Aug. 31, 2015 | May. 31, 2015
--- | --- | ---
Information regarding service contracts and other assets |  |
Service contracts, net | $ 75,306 | $ 42,434
Other assets, carrying amount | 69,303 | 65,423
Other assets, accumulated amortization | 48,395 | 47,929
Other assets, net | 20,908 | 17,494
Noncompete and consulting agreements |  |
Information regarding service contracts and other assets |  |
Other assets, carrying amount | 42,290 | 41,828
Other assets, accumulated amortization | 40,483 | 40,379
Other assets, net | 1,807 | 1,449
Other |  |
Information regarding service contracts and other assets |  |
Other assets, carrying amount | 27,013 | 23,595
Other assets, accumulated amortization | 7,912 | 7,550
Other assets, net | 19,101 | 16,045
Service Contracts |  |
Information regarding service contracts and other assets |  |
Service contracts, carrying amount | 375,647 | 340,816
Service contracts, accumulated amortization | 300,341 | 298,382
Service contracts, net | $ 75,306 | $ 42,434

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