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Goodwill, Service Contracts and Other Assets - Information Regarding Service Contracts and Other Assets (Details) - USD ($) $ in Thousands | Aug. 31, 2017 | May 31, 2017
--- | --- | ---
Information regarding service contracts and other assets |  |
Service contracts, net | $ 581,631 | $ 586,988
Other assets, carrying amount | 76,337 | 75,633
Other assets, accumulated amortization | 45,710 | 43,666
Other assets, net | 30,627 | 31,967
Noncompete and consulting agreements |  |
Information regarding service contracts and other assets |  |
Other assets, carrying amount | 40,918 | 40,743
Other assets, accumulated amortization | 39,516 | 39,244
Other assets, net | 1,402 | 1,499
Other |  |
Information regarding service contracts and other assets |  |
Other assets, carrying amount | 35,419 | 34,890
Other assets, accumulated amortization | 6,194 | 4,422
Other assets, net | 29,225 | 30,468
Service Contracts |  |
Information regarding service contracts and other assets |  |
Service contracts, carrying amount | 920,101 | 911,273
Service contracts, accumulated amortization | 338,470 | 324,285
Service contracts, net | $ 581,631 | $ 586,988

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