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Segment Disclosures - Summary of Revenue From Services by Geographic Area (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 28, 2014 | Sep. 28, 2014 | Jun. 29, 2014 | Mar. 30, 2014 | Dec. 29, 2013 | Sep. 29, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 28, 2014 | Dec. 29, 2013 | Dec. 30, 2012
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from services | $ 1,425.0 us-gaap_SalesRevenueServicesNet | $ 1,396.4 us-gaap_SalesRevenueServicesNet | $ 1,410.5 us-gaap_SalesRevenueServicesNet | $ 1,330.8 us-gaap_SalesRevenueServicesNet | $ 1,385.8 us-gaap_SalesRevenueServicesNet | $ 1,345.6 us-gaap_SalesRevenueServicesNet | $ 1,366.9 us-gaap_SalesRevenueServicesNet | $ 1,314.8 us-gaap_SalesRevenueServicesNet | $ 5,562.7 us-gaap_SalesRevenueServicesNet | $ 5,413.1 us-gaap_SalesRevenueServicesNet | $ 5,450.5 us-gaap_SalesRevenueServicesNet
Domestic |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from services |  |  |  |  |  |  |  |  | 3,535.8 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = kelya_DomesticMember | 3,419.9 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = kelya_DomesticMember | 3,464.2 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = kelya_DomesticMember
International |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from services |  |  |  |  |  |  |  |  | $ 2,026.9 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = kelya_InternationalMember | $ 1,993.2 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = kelya_InternationalMember | $ 1,986.3 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = kelya_InternationalMember

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- Definition Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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