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Goodwill, Service Contracts and Other Assets - Information Regarding Service Contracts and Other Assets (Details) - USD ($) $ in Thousands | Feb. 28, 2018 | May 31, 2017
--- | --- | ---
Information regarding service contracts and other assets |  |
Service contracts, net | $ 557,477 | $ 586,988
Other assets, carrying amount | 74,920 | 75,633
Other assets, accumulated amortization | 49,354 | 43,666
Other assets, net | 25,566 | 31,967
Noncompete and consulting agreements |  |
Information regarding service contracts and other assets |  |
Other assets, carrying amount | 41,358 | 40,743
Other assets, accumulated amortization | 39,740 | 39,244
Other assets, net | 1,618 | 1,499
Other |  |
Information regarding service contracts and other assets |  |
Other assets, carrying amount | 33,562 | 34,890
Other assets, accumulated amortization | 9,614 | 4,422
Other assets, net | 23,948 | 30,468
Service Contracts |  |
Information regarding service contracts and other assets |  |
Service contracts, carrying amount | 923,020 | 911,273
Service contracts, accumulated amortization | 365,543 | 324,285
Service contracts, net | $ 557,477 | $ 586,988

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