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Goodwill, Service Contracts and Other Assets Narrative (Details) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Feb. 28, 2013 | Nov. 30, 2012 | Feb. 29, 2012 | Feb. 28, 2013 | Feb. 29, 2012 | May 31, 2012
Goodwill, Service Contracts and Other Assets [Abstract] |  |  |  |  |  |
Cash surrender value of insurance policies | $ 70,500,000 |  |  | $ 70,500,000 |  | $ 57,400,000
Equity method investments | 27,700,000 |  |  | 27,700,000 |  | 31,900,000
Cost method investments | 900,000 |  |  | 900,000 |  | 900,000
Gain (Loss) on Sale of Equity Investments |  | 8,500,000 |  |  |  |
Amortization expense |  |  |  | 17,884,000 | 29,520,000 |
Estimated amortization expense, year one | 23,500,000 |  |  | 23,500,000 |  |
Estimated amortization expense, year two | 21,600,000 |  |  | 21,600,000 |  |
Estimated amortization expense, year three | 18,700,000 |  |  | 18,700,000 |  |
Estimated amortization expense, year four | 13,600,000 |  |  | 13,600,000 |  |
Estimated amortization expense, year five | 8,500,000 |  |  | 8,500,000 |  |
Cost method investments, losses due to impairment | $ 0 |  | $ 0 | $ 0 | $ 0 |

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