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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Aug. 31, 2013 segment | Aug. 31, 2012 | May 31, 2013
Disclosures related to operating segments |  |  |
Number of operating segments (segment) | 4 |  |
Revenue | $ 1,120,343 | $ 1,051,325 |
Income before income taxes | 123,615 | 122,773 |
Total assets | 4,311,177 | 4,157,035 | 4,345,632
Rental Uniforms and Ancillary Products [Member] |  |  |
Disclosures related to operating segments |  |  |
Revenue | 792,866 | 754,843 |
Income before income taxes | 117,393 | 116,907 |
Total assets | 2,842,058 | 2,779,217 |
Uniform Direct Sales [Member] |  |  |
Disclosures related to operating segments |  |  |
Revenue | 107,462 | 100,279 |
Income before income taxes | 8,681 | 8,741 |
Total assets | 143,993 | 125,094 |
First Aid, Safety and Fire Protection [Member] |  |  |
Disclosures related to operating segments |  |  |
Revenue | 125,875 | 110,841 |
Income before income taxes | 11,446 | 9,021 |
Total assets | 410,633 | 359,387 |
Document Management [Member] |  |  |
Disclosures related to operating segments |  |  |
Revenue | 94,140 | 85,362 |
Income before income taxes | 2,550 | 4,625 |
Total assets | 631,634 | 563,172 |
Corporate [Member] |  |  |
Disclosures related to operating segments |  |  |
Revenue | 0 | 0 |
Income before income taxes | (16,455) | (16,521) |
Total assets | $ 282,859 | $ 330,165 |

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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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