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Document And Entity Information (USD $)
12 Months Ended
Dec. 29, 2013
Jun. 30, 2013
Feb. 02, 2014
Common Class A [Member]
Feb. 02, 2014
Common Class B [Member]
Document Information [Line Items]        
Entity Registrant Name Kelly Services Inc      
Document Type 10-K      
Current Fiscal Year End Date --12-29      
Entity Common Stock, Shares Outstanding     33,970,737 3,451,161
Entity Public Float   $ 515,130,106    
Amendment Flag false      
Entity Central Index Key 0000055135      
Entity Current Reporting Status Yes      
Entity Voluntary Filers No      
Entity Filer Category Accelerated Filer      
Entity Well-known Seasoned Issuer No      
Document Period End Date Dec. 29, 2013      
Document Fiscal Year Focus 2013      
Document Fiscal Period Focus FY