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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Feb. 29, 2012 | Feb. 28, 2011 | Feb. 29, 2012 segment | Feb. 28, 2011 | May 31, 2011
Segment Information |  |  |  |  |
Number of operating segments |  |  | 4 |  |
Disclosures related to operating segments |  |  |  |  |
Total revenue | $ 1,012,112 | $ 937,827 | $ 3,048,418 | $ 2,798,297 |
Income before income taxes | 120,690 | 96,636 | 347,655 | 275,763 |
Total assets | 4,253,167 | 3,972,070 | 4,253,167 | 3,972,070 | 4,351,940
Rental Uniforms and Ancillary Products |  |  |  |  |
Disclosures related to operating segments |  |  |  |  |
Total revenue | 721,012 | 664,976 | 2,163,224 | 1,980,387 |
Income before income taxes | 112,471 | 85,558 | 316,366 | 241,888 |
Total assets | 2,543,951 | 2,508,299 | 2,543,951 | 2,508,299 |
Uniform Direct Sales |  |  |  |  |
Disclosures related to operating segments |  |  |  |  |
Total revenue | 109,114 | 102,598 | 322,762 | 310,167 |
Income before income taxes | 14,481 | 12,383 | 36,130 | 35,509 |
Total assets | 422,931 | 294,238 | 422,931 | 294,238 |
First Aid, Safety and Fire Protection |  |  |  |  |
Disclosures related to operating segments |  |  |  |  |
Total revenue | 101,378 | 91,195 | 306,808 | 278,044 |
Income before income taxes | 7,724 | 4,628 | 25,069 | 13,513 |
Total assets | 369,288 | 358,536 | 369,288 | 358,536 |
Document Management |  |  |  |  |
Disclosures related to operating segments |  |  |  |  |
Total revenue | 80,608 | 79,058 | 255,624 | 229,699 |
Income before income taxes | 2,860 | 6,307 | 21,230 | 20,556 |
Total assets | 564,383 | 594,292 | 564,383 | 594,292 |
Corporate |  |  |  |  |
Disclosures related to operating segments |  |  |  |  |
Income before income taxes | (16,846) | (12,240) | (51,140) | (35,703) |
Total assets | $ 352,614 | $ 216,705 | $ 352,614 | $ 216,705 |

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