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Goodwill, Service Contracts and Other Assets - Information Regarding Service Contracts and Other Assets (Details) - USD ($) $ in Thousands | Feb. 28, 2017 | May 31, 2016
--- | --- | ---
Information regarding service contracts and other assets |  |
Service contracts, net | $ 83,720 | $ 83,715
Other assets, carrying amount | 60,567 | 57,653
Other assets, accumulated amortization | 44,479 | 43,370
Other assets, net | 16,088 | 14,283
Noncompete and consulting agreements |  |
Information regarding service contracts and other assets |  |
Other assets, carrying amount | 42,822 | 42,378
Other assets, accumulated amortization | 41,278 | 40,928
Other assets, net | 1,544 | 1,450
Other |  |
Information regarding service contracts and other assets |  |
Other assets, carrying amount | 17,745 | 15,275
Other assets, accumulated amortization | 3,201 | 2,442
Other assets, net | 14,544 | 12,833
Service Contracts |  |
Information regarding service contracts and other assets |  |
Service contracts, carrying amount | 404,894 | 395,482
Service contracts, accumulated amortization | 321,174 | 311,767
Service contracts, net | $ 83,720 | $ 83,715

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