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Goodwill, Service Contracts and Other Assets (Details 3) (USD $) | 6 Months Ended |
--- | --- | ---
Nov. 30, 2011 | Nov. 30, 2010 | May 31, 2011
Information regarding service contracts and other assets |  |  |
Other Assets, Carrying Amount | $ 187,325,000 |  | $ 183,423,000
Other Assets, Accumulated Amortization | 72,841,000 |  | 68,672,000
Other Assets, Net | 114,484,000 |  | 114,751,000
Investments |  |  |
Cash surrender value of insurance policies | 54,800,000 |  | 51,100,000
Equity method investments | 30,800,000 |  | 30,200,000
Cost method investments | 2,900,000 |  | 2,900,000
Amortization |  |  |
Amortization expense | 20,104,000 | 21,182,000 |
Estimated amortization expense, year one | 37,900,000 |  |
Estimated amortization expense, year two | 21,100,000 |  |
Estimated amortization expense, year three | 17,600,000 |  |
Estimated amortization expense, year four | 14,800,000 |  |
Estimated amortization expense, year five | 9,600,000 |  |
Noncompete and consulting agreements |  |  |
Information regarding service contracts and other assets |  |  |
Other Assets, Carrying Amount | 75,790,000 |  | 76,091,000
Other Assets, Accumulated Amortization | 67,330,000 |  | 63,982,000
Other Assets, Net | 8,460,000 |  | 12,109,000
Investments |  |  |
Information regarding service contracts and other assets |  |  |
Other Assets, Carrying Amount | 88,469,000 |  | 84,197,000
Other Assets, Net | 88,469,000 |  | 84,197,000
Other |  |  |
Information regarding service contracts and other assets |  |  |
Other Assets, Carrying Amount | 23,066,000 |  | 23,135,000
Other Assets, Accumulated Amortization | 5,511,000 |  | 4,690,000
Other Assets, Net | 17,555,000 |  | 18,445,000
Service Contracts |  |  |
Information regarding service contracts and other assets |  |  |
Service contracts, Carrying Amount | 379,021,000 |  | 379,967,000
Service contracts, Accumulated Amortization | 292,360,000 |  | 277,655,000
Service contracts, Net | $ 86,661,000 |  | $ 102,312,000

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