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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Feb. 29, 2012
Feb. 28, 2011
Feb. 29, 2012
segment
Feb. 28, 2011
May 31, 2011
Segment Information          
Number of operating segments     4    
Disclosures related to operating segments          
Total revenue $ 1,012,112 $ 937,827 $ 3,048,418 $ 2,798,297  
Income before income taxes 120,690 96,636 347,655 275,763  
Total assets 4,253,167 3,972,070 4,253,167 3,972,070 4,351,940
Rental Uniforms and Ancillary Products
          
Disclosures related to operating segments          
Total revenue 721,012 664,976 2,163,224 1,980,387  
Income before income taxes 112,471 85,558 316,366 241,888  
Total assets 2,543,951 2,508,299 2,543,951 2,508,299  
Uniform Direct Sales
          
Disclosures related to operating segments          
Total revenue 109,114 102,598 322,762 310,167  
Income before income taxes 14,481 12,383 36,130 35,509  
Total assets 422,931 294,238 422,931 294,238  
First Aid, Safety and Fire Protection
          
Disclosures related to operating segments          
Total revenue 101,378 91,195 306,808 278,044  
Income before income taxes 7,724 4,628 25,069 13,513  
Total assets 369,288 358,536 369,288 358,536  
Document Management
          
Disclosures related to operating segments          
Total revenue 80,608 79,058 255,624 229,699  
Income before income taxes 2,860 6,307 21,230 20,556  
Total assets 564,383 594,292 564,383 594,292  
Corporate
          
Disclosures related to operating segments          
Income before income taxes (16,846) (12,240) (51,140) (35,703)  
Total assets $ 352,614 $ 216,705 $ 352,614 $ 216,705