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Operating Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2012 | Feb. 29, 2012 | Nov. 30, 2011 | Aug. 31, 2011 | May 31, 2011 | Feb. 28, 2011 | Nov. 30, 2010 | Aug. 31, 2010 | May 31, 2012 segment | May 31, 2011 | May 31, 2010
Disclosures related to operating segments |  |  |  |  |  |  |  |  |  |  |
Number of Operating Segments |  |  |  |  |  |  |  |  | 4 |  |
Revenue | $ 1,053,582 | $ 1,012,112 | $ 1,019,126 | $ 1,017,180 | $ 1,012,087 | $ 937,827 | $ 936,566 | $ 923,904 | $ 4,102,000 | $ 3,810,384 | $ 3,547,339
Gross Margin | 443,868 | 425,903 | 429,797 | 439,040 | 433,047 | 391,921 | 390,648 | 393,671 | 1,738,608 | 1,609,287 | 1,497,817
Selling and admin. expenses |  |  |  |  |  |  |  |  | 1,198,981 | 1,168,944 | 1,086,359
Legal settlements, net of insurance proceeds |  |  |  |  |  |  |  |  | 0 | 0 | 23,529
Restructuring credits |  |  |  |  |  |  |  |  | 0 | 0 | (2,880)
Interest income |  |  |  |  |  |  |  |  | (1,942) | (2,030) | (1,695)
Interest expense |  |  |  |  |  |  |  |  | 70,625 | 49,704 | 48,612
Income before income taxes |  |  |  |  |  |  |  |  | 470,944 | 392,669 | 343,892
Depreciation and amortization |  |  |  |  |  |  |  |  | 194,165 | 193,467 | 193,141
Capital expenditures |  |  |  |  |  |  |  |  | 160,802 | 182,592 | 111,078
Total assets | 4,160,906 |  |  |  | 4,351,940 |  |  |  | 4,160,906 | 4,351,940 | 3,969,736
Rental Uniforms and Ancillary Products [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosures related to operating segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 2,912,261 | 2,692,248 | 2,569,357
Gross Margin |  |  |  |  |  |  |  |  | 1,263,710 | 1,161,792 | 1,119,781
Selling and admin. expenses |  |  |  |  |  |  |  |  | 834,210 | 822,230 | 786,145
Legal settlements, net of insurance proceeds |  |  |  |  |  |  |  |  |  |  | 0
Restructuring credits |  |  |  |  |  |  |  |  |  |  | (2,880)
Interest income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  | 429,500 | 339,562 | 336,516
Depreciation and amortization |  |  |  |  |  |  |  |  | 121,842 | 122,767 | 131,714
Capital expenditures |  |  |  |  |  |  |  |  | 107,152 | 108,557 | 68,224
Total assets | 2,765,691 |  |  |  | 2,721,261 |  |  |  | 2,765,691 | 2,721,261 | 2,441,748
Uniform Direct Sales [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosures related to operating segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 433,994 | 419,222 | 386,370
Gross Margin |  |  |  |  |  |  |  |  | 129,614 | 126,475 | 116,336
Selling and admin. expenses |  |  |  |  |  |  |  |  | 80,577 | 78,220 | 76,232
Legal settlements, net of insurance proceeds |  |  |  |  |  |  |  |  |  |  | 0
Restructuring credits |  |  |  |  |  |  |  |  |  |  | 0
Interest income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  | 49,037 | 48,255 | 40,104
Depreciation and amortization |  |  |  |  |  |  |  |  | 7,087 | 6,720 | 7,582
Capital expenditures |  |  |  |  |  |  |  |  | 5,161 | 5,223 | 6,791
Total assets | 136,478 |  |  |  | 154,109 |  |  |  | 136,478 | 154,109 | 132,415
First Aid, Safety and Fire Protection [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosures related to operating segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 415,703 | 377,663 | 338,651
Gross Margin |  |  |  |  |  |  |  |  | 178,465 | 156,060 | 131,726
Selling and admin. expenses |  |  |  |  |  |  |  |  | 143,338 | 134,604 | 118,284
Legal settlements, net of insurance proceeds |  |  |  |  |  |  |  |  |  |  | 0
Restructuring credits |  |  |  |  |  |  |  |  |  |  | 0
Interest income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  | 35,127 | 21,456 | 13,442
Depreciation and amortization |  |  |  |  |  |  |  |  | 19,641 | 18,599 | 16,178
Capital expenditures |  |  |  |  |  |  |  |  | 15,264 | 23,215 | 8,155
Total assets | 362,128 |  |  |  | 355,332 |  |  |  | 362,128 | 355,332 | 329,569
Document Management [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosures related to operating segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 340,042 | 321,251 | 252,961
Gross Margin |  |  |  |  |  |  |  |  | 166,819 | 164,960 | 129,974
Selling and admin. expenses |  |  |  |  |  |  |  |  | 140,856 | 133,890 | 105,698
Legal settlements, net of insurance proceeds |  |  |  |  |  |  |  |  |  |  | 0
Restructuring credits |  |  |  |  |  |  |  |  |  |  | 0
Interest income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  | 25,963 | 31,070 | 24,276
Depreciation and amortization |  |  |  |  |  |  |  |  | 45,595 | 45,381 | 37,667
Capital expenditures |  |  |  |  |  |  |  |  | 33,225 | 45,597 | 27,908
Total assets | 556,784 |  |  |  | 595,912 |  |  |  | 556,784 | 595,912 | 499,917
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosures related to operating segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
Gross Margin |  |  |  |  |  |  |  |  | 0 | 0 | 0
Selling and admin. expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Legal settlements, net of insurance proceeds |  |  |  |  |  |  |  |  |  |  | 23,529
Restructuring credits |  |  |  |  |  |  |  |  |  |  | 0
Interest income |  |  |  |  |  |  |  |  | (1,942) | (2,030) | (1,695)
Interest expense |  |  |  |  |  |  |  |  | 70,625 | 49,704 | 48,612
Income before income taxes |  |  |  |  |  |  |  |  | (68,683) | (47,674) | (70,446)
Depreciation and amortization |  |  |  |  |  |  |  |  | 0 | 0 | 0
Capital expenditures |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total assets | $ 339,825 |  |  |  | $ 525,326 |  |  |  | $ 339,825 | $ 525,326 | $ 566,087

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