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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Nov. 30, 2011 | Nov. 30, 2010 | Nov. 30, 2011 segment | Nov. 30, 2010 | May 31, 2011
Segment Information |  |  |  |  |
Number of operating segments |  |  | 4 |  |
Disclosures related to operating segments |  |  |  |  |
Total revenue | $ 1,019,126 | $ 936,566 | $ 2,036,306 | $ 1,860,470 |
Income before income taxes | 115,360 | 90,577 | 226,965 | 179,127 |
Total assets | 4,215,312 | 3,928,295 | 4,215,312 | 3,928,295 | 4,351,940
Rental Uniforms and Ancillary Products |  |  |  |  |
Disclosures related to operating segments |  |  |  |  |
Total revenue | 722,789 | 657,847 | 1,442,212 | 1,315,411 |
Income before income taxes | 104,477 | 78,112 | 203,895 | 156,330 |
Total assets | 2,570,095 | 2,434,313 | 2,570,095 | 2,434,313 |
Uniform Direct Sales |  |  |  |  |
Disclosures related to operating segments |  |  |  |  |
Total revenue | 111,946 | 108,789 | 213,648 | 207,569 |
Income before income taxes | 13,242 | 13,279 | 21,649 | 23,126 |
Total assets | 390,475 | 262,810 | 390,475 | 262,810 |
First Aid, Safety and Fire Protection |  |  |  |  |
Disclosures related to operating segments |  |  |  |  |
Total revenue | 101,687 | 93,315 | 205,430 | 186,849 |
Income before income taxes | 8,962 | 5,107 | 17,345 | 8,885 |
Total assets | 364,461 | 360,908 | 364,461 | 360,908 |
Document Management |  |  |  |  |
Disclosures related to operating segments |  |  |  |  |
Total revenue | 82,704 | 76,615 | 175,016 | 150,641 |
Income before income taxes | 6,004 | 5,846 | 18,370 | 14,249 |
Total assets | 552,676 | 585,687 | 552,676 | 585,687 |
Corporate |  |  |  |  |
Disclosures related to operating segments |  |  |  |  |
Income before income taxes | (17,325) | (11,767) | (34,294) | (23,463) |
Total assets | $ 337,605 | $ 284,577 | $ 337,605 | $ 284,577 |

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