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Restructuring - Summary of Restructuring Reserve (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 28, 2014
Sep. 28, 2014
Jun. 29, 2014
Mar. 30, 2014
Dec. 29, 2013
Sep. 29, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 28, 2014
Dec. 29, 2013
Restructuring Reserve [Roll Forward]                    
Balance as of year-end       $ 0us-gaap_RestructuringReserve         $ 0us-gaap_RestructuringReserve  
Additions charged to reserve 6.2us-gaap_RestructuringCharges 4.0us-gaap_RestructuringCharges 1.8us-gaap_RestructuringCharges 0us-gaap_RestructuringCharges 0.3us-gaap_RestructuringCharges 0.5us-gaap_RestructuringCharges 0.8us-gaap_RestructuringCharges 0us-gaap_RestructuringCharges 12.0us-gaap_RestructuringCharges 1.6us-gaap_RestructuringCharges
Reductions for cash payments                 (5.1)us-gaap_PaymentsForRestructuring  
Balance as of year-end 6.9us-gaap_RestructuringReserve       0us-gaap_RestructuringReserve       6.9us-gaap_RestructuringReserve 0us-gaap_RestructuringReserve
EMEA and APAC                    
Restructuring Reserve [Roll Forward]                    
Additions charged to reserve                 2.1us-gaap_RestructuringCharges
/ us-gaap_StatementBusinessSegmentsAxis
= kelya_EMEAandAPACMember
 
Corporate                    
Restructuring Reserve [Roll Forward]                    
Additions charged to reserve                 $ 9.9us-gaap_RestructuringCharges
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember