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Segment Disclosures - Summary of Long-Lived Assets By Geographic Area (Details) (USD $)
In Millions, unless otherwise specified
Dec. 28, 2014
Dec. 29, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-Lived Assets $ 93.0us-gaap_PropertyPlantAndEquipmentNet $ 92.0us-gaap_PropertyPlantAndEquipmentNet
Domestic    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-Lived Assets 77.5us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= kelya_DomesticMember
74.3us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= kelya_DomesticMember
International    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-Lived Assets $ 15.5us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= kelya_InternationalMember
$ 17.7us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= kelya_InternationalMember