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Goodwill, Service Contracts and Other Assets (Information Regarding Service Contracts and Other Assets) (Details) (USD $) In Thousands, unless otherwise specified | May 31, 2014 | May 31, 2013 | May 31, 2012
--- | --- | --- | ---
Information regarding service contracts and other assets |  |  |
Service contracts, Net | $ 55,675 | $ 92,153 | $ 76,822
Other assets, Carrying Amount | 72,906 | 100,574 |
Other assets, Accumulated Amortization | 53,280 | 77,709 |
Other assets, Net | 19,626 | 22,865 |
Noncompete and consulting agreements [Member] |  |  |
Information regarding service contracts and other assets |  |  |
Other assets, Carrying Amount | 49,080 | 77,863 |
Other assets, Accumulated Amortization | 47,036 | 72,970 |
Other assets, Net | 2,044 | 4,893 |
Other [Member] |  |  |
Information regarding service contracts and other assets |  |  |
Other assets, Carrying Amount | 23,826 | 22,711 |
Other assets, Accumulated Amortization | 6,244 | 4,739 |
Other assets, Net | 17,582 | 17,972 |
Service contracts [Member] |  |  |
Information regarding service contracts and other assets |  |  |
Service contracts, Carrying Amount | 360,634 | 420,499 |
Service contracts, Accumulated Amortization | 304,959 | 328,346 |
Service contracts, Net | $ 55,675 | $ 92,153 |

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