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Goodwill, Service Contracts and Other Assets (Information Regarding Service Contracts and Other Assets) (Details) (USD $) | Aug. 31, 2013 | May 31, 2013
--- | --- | ---
Information regarding service contracts and other assets |  |  |  |
Service contracts, Net | $ 93,119,000 |  | $ 92,153,000 |
Other Assets, Carrying Amount | 202,159,000 |  | 202,099,000 |
Other Assets, Accumulated Amortization | 78,727,000 |  | 77,709,000 |
Other Assets, Net | 123,432,000 |  | 124,390,000 |
Cash surrender value of insurance policies | 72,000,000 |  | 73,000,000 |
Equity method investments | 27,700,000 |  | 27,600,000 |
Cost method investments | 900,000 |  | 900,000 |
Noncompete and consulting agreements [Member] |  |  |  |
Information regarding service contracts and other assets |  |  |  |
Other Assets, Carrying Amount | 78,833,000 |  | 77,863,000 |
Other Assets, Accumulated Amortization | 73,608,000 |  | 72,970,000 |
Other Assets, Net | 5,225,000 |  | 4,893,000 |
Investments [Member] |  |  |  |
Information regarding service contracts and other assets |  |  |  |
Other Assets, Carrying Amount | 100,648,000 | [1] | 101,525,000 | [1]
Other Assets, Accumulated Amortization | 0 | [1] | 0 | [1]
Other Assets, Net | 100,648,000 | [1] | 101,525,000 | [1]
Other [Member] |  |  |  |
Information regarding service contracts and other assets |  |  |  |
Other Assets, Carrying Amount | 22,678,000 |  | 22,711,000 |
Other Assets, Accumulated Amortization | 5,119,000 |  | 4,739,000 |
Other Assets, Net | 17,559,000 |  | 17,972,000 |
Service Contracts [Member] |  |  |  |
Information regarding service contracts and other assets |  |  |  |
Service contracts, Carrying Amount | 426,391,000 |  | 420,499,000 |
Service contracts, Accumulated Amortization | 333,272,000 |  | 328,346,000 |
Service contracts, Net | $ 93,119,000 |  | $ 92,153,000 |
[1] | Investments at August 31, 2013, include the cash surrender value of insurance policies of $72.0 million, equity method investments of $27.7 million and cost method investments of $0.9 million. Investments at May 31, 2013, include the cash surrender value of insurance policies of $73.0 million, equity method investments of $27.6 million and cost method investments of $0.9 million.

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