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Related Party Transactions (Details) (Class B common stock, Executive Chairman and Chairman of the Board and Director, Terence E. Adderley)	Dec. 28, 2014
Class B common stock | Executive Chairman and Chairman of the Board and Director | Terence E. Adderley
Related Party Transaction [Line Items]
Ownership Percentage of Parent Company	93.00%kelya_OwnershipPercentageofParentCompany / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = kelya_TerenceE.AdderleyMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_TitleOfIndividualAxis = kelya_ExecutiveChairmanandChairmanoftheBoardandDirectorMember

X

- Definition

Ownership Percentage of Parent Company

+ References

No definition available.

+ Details

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Period Type:	instant

X

- Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration