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Goodwill, Service Contracts and Other Assets (Details 3) (USD $) | 9 Months Ended |
--- | --- | ---
Feb. 29, 2012 | Feb. 28, 2011 | May 31, 2011
Information regarding service contracts and other assets |  |  |
Other Assets, Carrying Amount | $ 190,447,000 |  | $ 183,423,000
Other Assets, Accumulated Amortization | 74,981,000 |  | 68,672,000
Other Assets, Net | 115,466,000 |  | 114,751,000
Investments |  |  |
Cash surrender value of insurance policies | 58,100,000 |  | 51,100,000
Equity method investments | 32,700,000 |  | 30,200,000
Cost method investments | 800,000 |  | 2,900,000
Amortization |  |  |
Amortization expense | 29,520,000 | 32,166,000 |
Estimated amortization expense, year one | 38,100,000 |  |
Estimated amortization expense, year two | 21,500,000 |  |
Estimated amortization expense, year three | 18,100,000 |  |
Estimated amortization expense, year four | 15,200,000 |  |
Estimated amortization expense, year five | 9,800,000 |  |
Noncompete agreements |  |  |
Information regarding service contracts and other assets |  |  |
Other Assets, Carrying Amount | 76,231,000 |  | 76,091,000
Other Assets, Accumulated Amortization | 69,076,000 |  | 63,982,000
Other Assets, Net | 7,155,000 |  | 12,109,000
Investments |  |  |
Information regarding service contracts and other assets |  |  |
Other Assets, Carrying Amount | 91,638,000 |  | 84,197,000
Other Assets, Net | 91,638,000 |  | 84,197,000
Other |  |  |
Information regarding service contracts and other assets |  |  |
Other Assets, Carrying Amount | 22,578,000 |  | 23,135,000
Other Assets, Accumulated Amortization | 5,905,000 |  | 4,690,000
Other Assets, Net | 16,673,000 |  | 18,445,000
Service Contracts |  |  |
Information regarding service contracts and other assets |  |  |
Service contracts, Carrying Amount | 382,835,000 |  | 379,967,000
Service contracts, Accumulated Amortization | 301,169,000 |  | 277,655,000
Service contracts, Net | $ 81,666,000 |  | $ 102,312,000

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