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Goodwill, Service Contracts and Other Assets Narrative (Details) (USD $) | 3 Months Ended |
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Aug. 31, 2012 | Aug. 31, 2011 | May 31, 2012
Goodwill, Service Contracts and Other Assets [Abstract] |  |  |
Cash surrender value of insurance policies | $ 59,300,000 |  | $ 57,400,000
Equity method investments | 31,500,000 |  | 31,900,000
Cost method investments | 900,000 |  | 900,000
Amortization expense | 6,100,000 | 10,233,000 |
Estimated amortization expense, year one | 22,200,000 |  |
Estimated amortization expense, year two | 18,100,000 |  |
Estimated amortization expense, year three | 15,300,000 |  |
Estimated amortization expense, year four | 10,100,000 |  |
Estimated amortization expense, year five | $ 5,100,000 |  |

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