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Supplemental Cash Flow Information- Narrative (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 28, 2014 | Dec. 29, 2013 | Dec. 30, 2012
Interest paid | $ 1.6 us-gaap_InterestPaid | $ 2.0 us-gaap_InterestPaid | $ 2.6 us-gaap_InterestPaid
Income taxes paid | 10.9 us-gaap_IncomeTaxesPaidNet | 16.9 us-gaap_IncomeTaxesPaidNet | 18.8 us-gaap_IncomeTaxesPaidNet
Prior Year Understatement of Accrued Payroll and Related Taxes |  |  |
Amount of misstatement in current year financial statements |  | 4.8 us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = kelya_PriorYearUnderstatementofAccruedPayrollandRelatedTaxesMember |
Prior Year Understatement of Cash and Cash Equivalents |  |  |
Amount of misstatement in current year financial statements |  | 4.8 us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = kelya_PriorYearUnderstatementofCashandCashEquivalentsMember |
Prior Year Overstatement of Net Cash from Operating Activities |  |  |
Amount of misstatement in current year financial statements |  | 4.8 us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = kelya_PriorYearOverstatementofNetCashfromOperatingActivitiesMember |
Prior Year Overstatement of Operating Assets and Liabilities |  |  |
Amount of misstatement in current year financial statements |  | 4.8 us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = kelya_PriorYearOverstatementofOperatingAssetsandLiabilitiesMember |
Prior Year Understatement of Net Cash from Operating Activities |  |  |
Amount of misstatement in current year financial statements |  | 1.4 us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = kelya_PriorYearUnderstatementofNetCashfromOperatingActivitiesMember |
Prior Year Understatement of Net Cash used in Investing Activities |  |  |
Amount of misstatement in current year financial statements |  | $ 1.4 us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = kelya_PriorYearUnderstatementofNetCashusedinInvestingActivitiesMember |

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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 + Details
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