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Restructuring - Narrative (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 Cost and Reserve [Line Items]                    
Restructuring charges included in SG&A expenses $ 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
Restructuring Reserve 6.9us-gaap_RestructuringReserve       0us-gaap_RestructuringReserve       6.9us-gaap_RestructuringReserve 0us-gaap_RestructuringReserve
Americas                    
Restructuring Cost and Reserve [Line Items]                    
Number of branches closed                 52kelya_RestructuringandRelatedCostNumberofBranchesClosed
/ us-gaap_StatementBusinessSegmentsAxis
= kelya_Americas1Member
 
Corporate                    
Restructuring Cost and Reserve [Line Items]                    
Restructuring charges included in SG&A expenses                 9.9us-gaap_RestructuringCharges
/ us-gaap_ConsolidationItemsAxis
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2014 Management Simplification Restructuring Plan                    
Restructuring Cost and Reserve [Line Items]                    
Restructuring charges included in SG&A expenses                 9.9us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
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2014 Management Simplification Restructuring Plan | SG&A Expenses                    
Restructuring Cost and Reserve [Line Items]                    
Number of positions eliminated                 112us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated
/ us-gaap_IncomeStatementLocationAxis
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2014 Management Simplification Restructuring Plan | Americas                    
Restructuring Cost and Reserve [Line Items]                    
Restructuring charges included in SG&A expenses                 4.0us-gaap_RestructuringCharges
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/ us-gaap_StatementBusinessSegmentsAxis
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2014 Management Simplification Restructuring Plan | Americas | SG&A Expenses                    
Restructuring Cost and Reserve [Line Items]                    
Number of positions eliminated                 40us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated
/ us-gaap_IncomeStatementLocationAxis
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2014 Management Simplification Restructuring Plan | OCG                    
Restructuring Cost and Reserve [Line Items]                    
Restructuring charges included in SG&A expenses                 1.3us-gaap_RestructuringCharges
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/ us-gaap_StatementBusinessSegmentsAxis
= kelya_OCGMember
 
2014 Management Simplification Restructuring Plan | OCG | SG&A Expenses                    
Restructuring Cost and Reserve [Line Items]                    
Number of positions eliminated                 8us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated
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2014 Management Simplification Restructuring Plan | Corporate                    
Restructuring Cost and Reserve [Line Items]                    
Restructuring charges included in SG&A expenses                 $ 4.6us-gaap_RestructuringCharges
/ us-gaap_ConsolidationItemsAxis
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/ us-gaap_RestructuringPlanAxis
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2014 Management Simplification Restructuring Plan | Corporate | SG&A Expenses                    
Restructuring Cost and Reserve [Line Items]                    
Number of positions eliminated                 64us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated
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Number of positions eliminated recognized as a one-time benefit                 53kelya_RestructuringandRelatedCostNumberofPositionsEliminatedOneTimeBenefit
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Number of positions eliminated recognized as contract termination costs                 11kelya_RestructuringandRelatedCostNumberofPositionsEliminatedContractTermination
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