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Stockholders' Equity - Narrative (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012
Class of Stock [Line Items]
Dividends	$ 7.6us-gaap_DividendsCommonStockCash	$ 7.6us-gaap_DividendsCommonStockCash	$ 7.6us-gaap_DividendsCommonStockCash
Temp Holdings Investment
Class of Stock [Line Items]
Income tax valuation allowance		$ 1.1us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityOther / invest_InvestmentAxis = kelya_TempHoldingsInvestmentMember
Class A common stock
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	100,000,000us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Class B common stock
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	10,000,000us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember

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- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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-Number 210

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-Paragraph 30

-Article 5

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

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The tax effect of items occurring during the period that have been charged or credited directly to components of shareholders' equity and are not otherwise defined.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 20

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=18498875&loc=d3e39076-109324

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