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Contingencies - Narrative (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 3 Months Ended
--- | --- | ---
Apr. 30, 2014 | Dec. 29, 2013 | Dec. 28, 2014
Loss Contingencies [Line Items] |  |  |
Accrual for litigation costs |  | $ 6.9 us-gaap_LossContingencyAccrualAtCarryingValue | $ 5.7 us-gaap_LossContingencyAccrualAtCarryingValue
Estimated insurance recoveries |  | 13.4 us-gaap_EstimatedInsuranceRecoveries | 11.5 us-gaap_EstimatedInsuranceRecoveries
Judgement Against Jefferson Parish School Board And Kelly Service |  |  |
Loss Contingencies [Line Items] |  |  |
Loss contingency damages awarded |  | 4.4 us-gaap_LossContingencyDamagesAwardedValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = kelya_JudgementAgainstJeffersonParishSchoolBoardAndKellyServicesMember |
Litigation Settlement, Amount | (1.00)us-gaap_LitigationSettlementAmount / us-gaap_LossContingenciesByNatureOfContingencyAxis = kelya_JudgementAgainstJeffersonParishSchoolBoardAndKellyServicesMember |  |
Estimated insurance recoveries |  | 3.1 us-gaap_EstimatedInsuranceRecoveries / us-gaap_LossContingenciesByNatureOfContingencyAxis = kelya_JudgementAgainstJeffersonParishSchoolBoardAndKellyServicesMember | 1.7 us-gaap_EstimatedInsuranceRecoveries / us-gaap_LossContingenciesByNatureOfContingencyAxis = kelya_JudgementAgainstJeffersonParishSchoolBoardAndKellyServicesMember
Kelly Services Share |  |  |
Loss Contingencies [Line Items] |  |  |
Loss contingency damages awarded |  |  | 2.7 us-gaap_LossContingencyDamagesAwardedValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = kelya_KellyServicesShareMember
Parent Company | Judgement Against Jefferson Parish School Board And Kelly Service |  |  |
Loss Contingencies [Line Items] |  |  |
Litigation Settlement, Amount | (0.25)us-gaap_LitigationSettlementAmount / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = kelya_JudgementAgainstJeffersonParishSchoolBoardAndKellyServicesMember |  |
Primary Insurer | Judgement Against Jefferson Parish School Board And Kelly Service |  |  |
Loss Contingencies [Line Items] |  |  |
Litigation Settlement, Amount | $ (0.75)us-gaap_LitigationSettlementAmount / dei_LegalEntityAxis = kelya_PrimaryInsurerMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = kelya_JudgementAgainstJeffersonParishSchoolBoardAndKellyServicesMember |  |

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- Definition Carrying amount as of the balance sheet date of amounts expected to be recovered under the terms of insurance contracts. + 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 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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- Definition Amount of judgment or settlement awarded to (against) the entity in respect of litigation. + References No definition available. + Details
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- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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- Definition Amount of damages awarded to the plaintiff in the legal matter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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