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Fair Value Measurements - Narrative (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 29, 2013 | Sep. 29, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 28, 2014 | Dec. 29, 2013 | Dec. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Unrealized gains on investment, net of tax |  |  |  |  | $ 11.5 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | $ 31.2 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | $ 13.1 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Asset impairment charges | 0 us-gaap_AssetImpairmentCharges | 0 us-gaap_AssetImpairmentCharges | 1.7 us-gaap_AssetImpairmentCharges | 0 us-gaap_AssetImpairmentCharges | 0 us-gaap_AssetImpairmentCharges | 1.7 us-gaap_AssetImpairmentCharges | 3.1 us-gaap_AssetImpairmentCharges
Temp Holdings Investment |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Unrealized gains on investment, net of tax |  |  |  |  | 11.5 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kelya_TempHoldingsInvestmentMember | 30.1 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kelya_TempHoldingsInvestmentMember |
Cost of investment | $ 19.7 us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kelya_TempHoldingsInvestmentMember |  |  |  | $ 17.2 us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kelya_TempHoldingsInvestmentMember | $ 19.7 us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kelya_TempHoldingsInvestmentMember |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
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- Definition This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- Definition Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
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