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Stock-Based Compensation - Narrative (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Plan activity adjustment period	5 years
Number of shares available for grant (in shares)	1,170,406us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Tax benefit	$ 2.9us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	$ 2.3us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	$ 2.3us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Award vesting period	3 years
Unrecognized compensation cost, unvested restricted stock	16.4us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
Compensation cost not yet recognized, period for recognition	2 years
Grants in period (in dollars per share)	$ 15.63us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	$ 19.74us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	$ 12.98us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Vested in period, fair value	7.1us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	6.5us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	4.1us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
Term to exercise stock option before expiration (not more than)	10 years
Grants in period (in shares)	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Outstanding (in shares)	33,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	162,613us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Unrecognized compensation cost, unvested stock options	0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
Exercises in period (in shares)	0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised	0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised	0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Stock-based compensation cost
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation cost	7.6us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_NatureOfExpenseAxis = kelya_StockBasedCompensationCostMember	6.0us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_NatureOfExpenseAxis = kelya_StockBasedCompensationCostMember	6.0us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_NatureOfExpenseAxis = kelya_StockBasedCompensationCostMember
Non-Employee Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding (in shares)	24,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_TitleOfIndividualAxis = kelya_NonEmployeeDirectorMember
Windfall
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Excess Tax Benefit from Share-based Compensation, Financing Activities	$ 0.4us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = kelya_WindfallMember	$ 0.5us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = kelya_WindfallMember
Minimum | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Class A common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares available for grants	10.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Number of share options (or share units) exercised during the current period.

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