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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
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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

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- Definition Ownership Percentage of Parent Company + References No definition available. + Details
Name: | kelya_OwnershipPercentageofParentCompany
Namespace Prefix: | kelya_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration