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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