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Goodwill, Service Contracts and Other Assets - Information Regarding Service Contracts and Other Assets (Details) - USD ($) $ in Thousands | May 31, 2017 | May 31, 2016 | May 31, 2015
--- | --- | --- | ---
Information regarding service contracts and other assets |  |  |
Service contracts, net | $ 586,988 | $ 78,194 | $ 35,650
Other assets, carrying amount | 75,633 | 55,513 |
Other assets, accumulated amortization | 43,666 | 41,230 |
Other assets, net | 31,967 | 14,283 |
Noncompete and consulting agreements |  |  |
Information regarding service contracts and other assets |  |  |
Other assets, carrying amount | 40,743 | 40,238 |
Other assets, accumulated amortization | 39,244 | 38,788 |
Other assets, net | 1,499 | 1,450 |
Other |  |  |
Information regarding service contracts and other assets |  |  |
Other assets, carrying amount | 34,890 | 15,275 |
Other assets, accumulated amortization | 4,422 | 2,442 |
Other assets, net | 30,468 | 12,833 |
Service contracts |  |  |
Information regarding service contracts and other assets |  |  |
Service contracts, carrying amount | 911,273 | 382,858 |
Service contracts, accumulated amortization | 324,285 | 304,664 |
Service contracts, net | $ 586,988 | $ 78,194 |

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