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Acquisitions (Narrative) (Details) | 12 Months Ended
--- | ---
May 31, 2013 segment_business | May 31, 2012 segment_business
Rental Uniforms and Ancillary Products [Member] |  |
Business Acquisition [Line Items] |  |
Number of businesses acquired |  | 2
First Aid, Safety and Fire Protection [Member] |  |
Business Acquisition [Line Items] |  |
Number of businesses acquired | 3 | 2
Document Management [Member] |  |
Business Acquisition [Line Items] |  |
Number of businesses acquired | 12 | 4

X
- Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of businesses acquired by the entity during the period. + References No definition available. + Details
Name: | us-gaap_NumberOfBusinessesAcquired
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration