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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Aug. 31, 2012 segment | Aug. 31, 2011 | May 31, 2012
Disclosures related to operating segments |  |  |
Number of Operating Segments | 4 |  |
Revenue | $ 1,051,325 | $ 1,017,180 |
Income before income taxes | 122,773 | 111,605 |
Total assets | 4,152,235 | 4,127,892 | 4,160,906
Rental Uniforms and Ancillary Products [Member] |  |  |
Disclosures related to operating segments |  |  |
Revenue | 754,843 | 719,423 |
Income before income taxes | 116,907 | 99,418 |
Total assets | 2,774,417 | 2,761,317 |
Uniform Direct Sales [Member] |  |  |
Disclosures related to operating segments |  |  |
Revenue | 100,279 | 101,702 |
Income before income taxes | 8,741 | 8,407 |
Total assets | 125,094 | 150,228 |
First Aid, Safety and Fire Protection [Member] |  |  |
Disclosures related to operating segments |  |  |
Revenue | 110,841 | 103,743 |
Income before income taxes | 9,021 | 8,383 |
Total assets | 359,387 | 363,692 |
Document Management [Member] |  |  |
Disclosures related to operating segments |  |  |
Revenue | 85,362 | 92,312 |
Income before income taxes | 4,625 | 12,366 |
Total assets | 563,172 | 575,615 |
Corporate [Member] |  |  |
Disclosures related to operating segments |  |  |
Revenue | 0 | 0 |
Income before income taxes | (16,521) | (16,969) |
Total assets | $ 330,165 | $ 277,040 |

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