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Income Taxes - Narrative (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			3 Months Ended
	Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012	Mar. 31, 2013	Jan. 01, 2012
Income Taxes [Line Items]
U.S. statutory rate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Tax credits	$ 17.5us-gaap_IncomeTaxReconciliationTaxCredits	$ 26.2us-gaap_IncomeTaxReconciliationTaxCredits	$ 7.9us-gaap_IncomeTaxReconciliationTaxCredits
Tax examination benefit			5.1us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions
Loss carryforwards	47.2us-gaap_DeferredTaxAssetsOperatingLossCarryforwards	49.4us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Undistributed earnings of foreign subsidiaries	111.2us-gaap_UndistributedEarningsOfForeignSubsidiaries
Unrecognized tax benefits	2.4us-gaap_UnrecognizedTaxBenefits	2.8us-gaap_UnrecognizedTaxBenefits	2.9us-gaap_UnrecognizedTaxBenefits		7.8us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits that would impact effective tax rate	1.5us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	1.8us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	1.9us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Unrecognized tax benefits, interest on income taxes expense	0.1us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	0.1us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	(0.3)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense
Unrecognized tax benefits, interest on income taxes accrued	0.4us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	0.3us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Significant change in unrecognized tax benefits is reasonably possible, amount of unrecorded benefit	0.3us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit
General Business Tax Credit Carryforward
Income Taxes [Line Items]
Tax benefit recognized with enacted law				9.3kelya_TaxBenefitRecognizedWithEnactedLaw / us-gaap_TaxCreditCarryforwardAxis = us-gaap_GeneralBusinessMember
General business credit carryforward	100.8us-gaap_TaxCreditCarryforwardAmount / us-gaap_TaxCreditCarryforwardAxis = us-gaap_GeneralBusinessMember
Foreign Tax Credit Carryforward
Income Taxes [Line Items]
General business credit carryforward	2.0us-gaap_TaxCreditCarryforwardAmount / us-gaap_TaxCreditCarryforwardAxis = kelya_ForeignTaxCreditCarryforwardMember
State Credit Carryforward
Income Taxes [Line Items]
General business credit carryforward	$ 0.2us-gaap_TaxCreditCarryforwardAmount / us-gaap_TaxCreditCarryforwardAxis = kelya_StateCreditCarryforwardMember

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U.S. work opportunity credits to be recognized in a subsequent period.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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