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Document and Entity Information (USD $)
 12 Months Ended
Dec. 28, 2014
Jun. 29, 2014
Feb. 01, 2015
Document Information [Line Items]      
Entity Registrant Name Kelly Services Inc    
Document Type 10-K    
Current Fiscal Year End Date --12-28    
Entity Public Float   $ 521,767,042dei_EntityPublicFloat  
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. 28, 2014    
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY    
Class A common stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding     34,274,299dei_EntityCommonStockSharesOutstanding
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Class B common stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding     3,451,261dei_EntityCommonStockSharesOutstanding
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= us-gaap_CommonClassBMember