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Income Taxes - Differences Between Income Taxes From Continuing Operations and U.S. Statutory Rate (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012
Income Tax Disclosure [Abstract]
Income tax based on statutory rate	$ 5.8us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 17.1us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 24.1us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal benefit	0.7us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	1.2us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	2.6us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
General business credits	(17.5)us-gaap_IncomeTaxReconciliationTaxCredits	(26.2)us-gaap_IncomeTaxReconciliationTaxCredits	(7.9)us-gaap_IncomeTaxReconciliationTaxCredits
Life insurance cash surrender value	(2.2)kelya_IncomeTaxReconciliationLifeInsuranceCashSurrenderValue	(5.8)kelya_IncomeTaxReconciliationLifeInsuranceCashSurrenderValue	(3.4)kelya_IncomeTaxReconciliationLifeInsuranceCashSurrenderValue
Foreign items	(0.2)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	0.3us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	1.6us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Foreign business taxes	4.2kelya_IncomeTaxReconciliationForeignBusinessTaxes	3.9kelya_IncomeTaxReconciliationForeignBusinessTaxes	4.5kelya_IncomeTaxReconciliationForeignBusinessTaxes
Foreign tax law change	(2.2)kelya_ForeignTaxLawChange	(4.6)kelya_ForeignTaxLawChange	0kelya_ForeignTaxLawChange
Non-deductible expenses	2.1kelya_Nondeductibleexpenses	1.6kelya_Nondeductibleexpenses	3.1kelya_Nondeductibleexpenses
Change in deferred tax realizability	2.2us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	2.8us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	(0.7)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Uncertain tax positions	0us-gaap_IncomeTaxReconciliationTaxContingencies	0us-gaap_IncomeTaxReconciliationTaxContingencies	(4.8)us-gaap_IncomeTaxReconciliationTaxContingencies
Other, net	0us-gaap_IncomeTaxReconciliationOtherAdjustments	(0.4)us-gaap_IncomeTaxReconciliationOtherAdjustments	0us-gaap_IncomeTaxReconciliationOtherAdjustments
Total provision	$ (7.1)us-gaap_IncomeTaxExpenseBenefit	$ (10.1)us-gaap_IncomeTaxExpenseBenefit	$ 19.1us-gaap_IncomeTaxExpenseBenefit

X

- Definition

The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to changes in the enacted income tax laws in foreign countries in the period.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates attributable to foreign business taxes classified as income taxes which are based on revenue or receipts reduced by one or more category of expense.

+ References

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- Definition

The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates attributable to gains and losses on company owned life insurance contracts.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates attributable to Named Executive compensation in excess of statutorily deductible limits and other non-deductible expenses.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign income tax expense (benefit).

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit).

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in income tax contingencies. Including, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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