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Goodwill, Service Contracts and Other Assets (Details 3) (USD $) In Thousands, unless otherwise specified | Aug. 31, 2012 | May 31, 2012
--- | --- | ---
Information regarding service contracts and other assets |  |  |  |
Service contracts, Net | $ 72,297 |  | $ 76,822 |
Other Assets, Carrying Amount | 188,025 |  | 186,062 |
Other Assets, Accumulated Amortization | 74,829 |  | 73,226 |
Other Assets, Net | 113,196 |  | 112,836 |
Noncompete agreements [Member] |  |  |  |
Information regarding service contracts and other assets |  |  |  |
Other Assets, Carrying Amount | 76,279 |  | 76,036 |
Other Assets, Accumulated Amortization | 71,177 |  | 69,954 |
Other Assets, Net | 5,102 |  | 6,082 |
Investments [Member] |  |  |  |
Information regarding service contracts and other assets |  |  |  |
Other Assets, Carrying Amount | 91,723 | [1] | 90,198 | [1]
Other Assets, Accumulated Amortization | 0 | [1] | 0 | [1]
Other Assets, Net | 91,723 | [1] | 90,198 | [1]
Other [Member] |  |  |  |
Information regarding service contracts and other assets |  |  |  |
Other Assets, Carrying Amount | 20,023 |  | 19,828 |
Other Assets, Accumulated Amortization | 3,652 |  | 3,272 |
Other Assets, Net | 16,371 |  | 16,556 |
Service Contracts [Member] |  |  |  |
Information regarding service contracts and other assets |  |  |  |
Service contracts, Carrying Amount | 386,144 |  | 384,622 |
Service contracts, Accumulated Amortization | 313,847 |  | 307,800 |
Service contracts, Net | $ 72,297 |  | $ 76,822 |
[1] | Investments at August 31, 2012, include the cash surrender value of insurance policies of $59.3 million, equity method investments of $31.5 million and cost method investments of $0.9 million. Investments at May 31, 2012, include the cash surrender value of insurance policies of $57.4 million, equity method investments of $31.9 million and cost method investments of $0.9 million.

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