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Goodwill, Service Contracts and Other Assets Narrative (Details) (USD $) | 12 Months Ended
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May 31, 2012 | May 31, 2011 | May 31, 2010
Goodwill, Service Contracts and Other Assets [Abstract] |  |  |
Cash surrender value of insurance policies | $ 57,400,000 | $ 51,100,000 |
Equity method investments | 31,900,000 | 30,200,000 |
Cost method investments | 900,000 | 2,900,000 |
Amortization expense | 38,334,000 | 42,581,000 | 41,082,000
Estimated amortization expense, year one | 21,800,000 |  |
Estimated amortization expense, year two | 18,400,000 |  |
Estimated amortization expense, year three | 15,500,000 |  |
Estimated amortization expense, year four | 10,200,000 |  |
Estimated amortization expense, year five | $ 5,000,000 |  |

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