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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
	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	$ 1,425.0us-gaap_SalesRevenueServicesNet	$ 1,396.4us-gaap_SalesRevenueServicesNet	$ 1,410.5us-gaap_SalesRevenueServicesNet	$ 1,330.8us-gaap_SalesRevenueServicesNet	$ 1,385.8us-gaap_SalesRevenueServicesNet	$ 1,345.6us-gaap_SalesRevenueServicesNet	$ 1,366.9us-gaap_SalesRevenueServicesNet	$ 1,314.8us-gaap_SalesRevenueServicesNet	$ 5,562.7us-gaap_SalesRevenueServicesNet	$ 5,413.1us-gaap_SalesRevenueServicesNet	$ 5,450.5us-gaap_SalesRevenueServicesNet
Domestic
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from services									3,535.8us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = kelya_DomesticMember	3,419.9us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = kelya_DomesticMember	3,464.2us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = kelya_DomesticMember
International
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from services									$ 2,026.9us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = kelya_InternationalMember	$ 1,993.2us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = kelya_InternationalMember	$ 1,986.3us-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

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