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Segment Disclosures - Segment Revenue Per Service (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
Revenue from Services:
Segment revenue for service	$ 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
Less: Intersegment revenue
Revenue from Services:
Segment revenue for service									(66.9)us-gaap_SalesRevenueServicesNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember	(49.7)us-gaap_SalesRevenueServicesNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember	(35.4)us-gaap_SalesRevenueServicesNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember
Americas Commercial
Revenue from Services:
Segment revenue for service									2,609.6us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = kelya_AmericasCommercialMember	2,545.6us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = kelya_AmericasCommercialMember	2,642.4us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = kelya_AmericasCommercialMember
Americas PT
Revenue from Services:
Segment revenue for service									956.0us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = kelya_AmericasPTMember	967.8us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = kelya_AmericasPTMember	992.1us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = kelya_AmericasPTMember
Total Americas Commercial and PT
Revenue from Services:
Segment revenue for service									3,565.6us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = kelya_Americas1Member	3,513.4us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = kelya_Americas1Member	3,634.5us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = kelya_Americas1Member
EMEA Commercial
Revenue from Services:
Segment revenue for service									894.7us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = kelya_EMEACommercialMember	877.5us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = kelya_EMEACommercialMember	854.6us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = kelya_EMEACommercialMember
EMEA PT
Revenue from Services:
Segment revenue for service									190.3us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = kelya_EMEAPTMember	179.7us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = kelya_EMEAPTMember	168.3us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = kelya_EMEAPTMember
Total EMEA Commercial and PT
Revenue from Services:
Segment revenue for service									1,085.0us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = kelya_EMEA1Member	1,057.2us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = kelya_EMEA1Member	1,022.9us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = kelya_EMEA1Member
APAC Commercial
Revenue from Services:
Segment revenue for service									351.8us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = kelya_APACCommercialMember	344.1us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = kelya_APACCommercialMember	343.2us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = kelya_APACCommercialMember
APAC PT
Revenue from Services:
Segment revenue for service									40.4us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = kelya_APACPTMember	38.6us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = kelya_APACPTMember	51.6us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = kelya_APACPTMember
Total APAC Commercial and PT
Revenue from Services:
Segment revenue for service									392.2us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = kelya_APACMember	382.7us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = kelya_APACMember	394.8us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = kelya_APACMember
OCG
Revenue from Services:
Segment revenue for service									$ 586.8us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = kelya_OCGMember	$ 509.5us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = kelya_OCGMember	$ 433.7us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = kelya_OCGMember

X

- 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

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