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Income Taxes - Net Tax Effect of State and Foreign Loss Carryforwards (Details) (USD $)
In Millions, unless otherwise specified
Dec. 28, 2014
Operating Loss Carryforwards [Line Items]  
No expiration $ 41.3us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration
Total 47.2us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration
2015-2017  
Operating Loss Carryforwards [Line Items]  
Total 1.9us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration
/ us-gaap_TaxPeriodAxis
= kelya_ExpiringinYears2015to2017Member
2018-2020  
Operating Loss Carryforwards [Line Items]  
Total 2.5us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration
/ us-gaap_TaxPeriodAxis
= kelya_ExpiringinYears2018to2020Member
2021-2024  
Operating Loss Carryforwards [Line Items]  
Total 1.2us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration
/ us-gaap_TaxPeriodAxis
= kelya_ExpiringinYears2021to2024Member
2025-2031  
Operating Loss Carryforwards [Line Items]  
Total $ 0.3us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration
/ us-gaap_TaxPeriodAxis
= kelya_ExpiringinYears2025to2031Member