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Property and Equipment (Tables) | 12 Months Ended
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May 31, 2012
Property, Plant and Equipment [Abstract] |
Property and Equipment | Property and Equipment
(In thousands) | 2012 |  | 2011
Land | $ | 104,850 |  |  | $ | 103,838 |
Buildings and improvements | 492,293 |  |  | 484,254 |
Equipment | 1,478,270 |  |  | 1,334,943 |
Leasehold improvements | 25,502 |  |  | 21,763 |
Construction in progress | 62,370 |  |  | 97,598 |
| 2,163,285 |  |  | 2,042,396 |
Less: accumulated depreciation | 1,218,980 |  |  | 1,096,178 |
| $ | 944,305 |  |  | $ | 946,218 |

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