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Operating Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2013 | Feb. 28, 2013 | Nov. 30, 2012 | Aug. 31, 2012 | May 31, 2012 | Feb. 29, 2012 | Nov. 30, 2011 | Aug. 31, 2011 | May 31, 2013 segment | May 31, 2012 | May 31, 2011
Disclosures related to operating segments |  |  |  |  |  |  |  |  |  |  |
Number of operating segments (segment) |  |  |  |  |  |  |  |  | 4 |  |
Revenue | $ 1,129,086 | $ 1,075,674 | $ 1,060,386 | $ 1,051,325 | $ 1,053,582 | $ 1,012,112 | $ 1,019,126 | $ 1,017,180 | $ 4,316,471 | $ 4,102,000 | $ 3,810,384
Gross margin | 467,215 | 441,941 | 432,036 | 445,875 | 443,868 | 425,903 | 429,797 | 439,040 | 1,787,067 | 1,738,608 | 1,609,287
Selling and admin. expenses |  |  |  |  |  |  |  |  | 1,221,856 | 1,198,981 | 1,168,944
Interest income |  |  |  |  |  |  |  |  | (409) | (1,942) | (2,030)
Interest expense |  |  |  |  |  |  |  |  | 65,712 | 70,625 | 49,704
Income before income taxes |  |  |  |  |  |  |  |  | 499,908 | 470,944 | 392,669
Depreciation and amortization |  |  |  |  |  |  |  |  | 189,377 | 194,165 | 193,467
Capital expenditures |  |  |  |  |  |  |  |  | 196,486 | 160,802 | 182,592
Total assets | 4,345,632 |  |  |  | 4,165,706 |  |  |  | 4,345,632 | 4,165,706 | 4,351,940
Rental Uniforms and Ancillary Products [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosures related to operating segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 3,044,587 | 2,912,261 | 2,692,248
Gross margin |  |  |  |  |  |  |  |  | 1,288,290 | 1,263,710 | 1,161,792
Selling and admin. expenses |  |  |  |  |  |  |  |  | 835,249 | 834,210 | 822,230
Interest income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  | 453,041 | 429,500 | 339,562
Depreciation and amortization |  |  |  |  |  |  |  |  | 116,867 | 121,842 | 122,767
Capital expenditures |  |  |  |  |  |  |  |  | 140,327 | 107,152 | 108,557
Total assets | 2,830,941 |  |  |  | 2,770,491 |  |  |  | 2,830,941 | 2,770,491 | 2,721,261
Uniform Direct Sales [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosures related to operating segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 461,328 | 433,994 | 419,222
Gross margin |  |  |  |  |  |  |  |  | 134,985 | 129,614 | 126,475
Selling and admin. expenses |  |  |  |  |  |  |  |  | 81,739 | 80,577 | 78,220
Interest income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  | 53,246 | 49,037 | 48,255
Depreciation and amortization |  |  |  |  |  |  |  |  | 8,049 | 7,087 | 6,720
Capital expenditures |  |  |  |  |  |  |  |  | 6,908 | 5,161 | 5,223
Total assets | 152,551 |  |  |  | 136,478 |  |  |  | 152,551 | 136,478 | 154,109
First Aid, Safety and Fire Protection [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosures related to operating segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 460,592 | 415,703 | 377,663
Gross margin |  |  |  |  |  |  |  |  | 199,314 | 178,465 | 156,060
Selling and admin. expenses |  |  |  |  |  |  |  |  | 156,232 | 143,338 | 134,604
Interest income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  | 43,082 | 35,127 | 21,456
Depreciation and amortization |  |  |  |  |  |  |  |  | 20,832 | 19,641 | 18,599
Capital expenditures |  |  |  |  |  |  |  |  | 11,809 | 15,264 | 23,215
Total assets | 398,614 |  |  |  | 362,128 |  |  |  | 398,614 | 362,128 | 355,332
Document Management [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosures related to operating segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 349,964 | 340,042 | 321,251
Gross margin |  |  |  |  |  |  |  |  | 164,478 | 166,819 | 164,960
Selling and admin. expenses |  |  |  |  |  |  |  |  | 148,636 | 140,856 | 133,890
Interest income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  | 15,842 | 25,963 | 31,070
Depreciation and amortization |  |  |  |  |  |  |  |  | 43,629 | 45,595 | 45,381
Capital expenditures |  |  |  |  |  |  |  |  | 37,442 | 33,225 | 45,597
Total assets | 605,573 |  |  |  | 556,784 |  |  |  | 605,573 | 556,784 | 595,912
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosures related to operating segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
Gross margin |  |  |  |  |  |  |  |  | 0 | 0 | 0
Selling and admin. expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest income |  |  |  |  |  |  |  |  | (409) | (1,942) | (2,030)
Interest expense |  |  |  |  |  |  |  |  | 65,712 | 70,625 | 49,704
Income before income taxes |  |  |  |  |  |  |  |  | (65,303) | (68,683) | (47,674)
Depreciation and amortization |  |  |  |  |  |  |  |  | 0 | 0 | 0
Capital expenditures |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total assets | $ 357,953 |  |  |  | $ 339,825 |  |  |  | $ 357,953 | $ 339,825 | $ 525,326

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- Definition Income derived from investments in debt securities and on cash and cash equivalents the earnings of which reflect the time value of money or transactions in which the payments are for the use or forbearance of money. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 14 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(b)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + 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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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6386349&loc=d3e3636-108311 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Paragraph 5A -Chapter 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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