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Restructuring - Narrative (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges included in SG&A expenses | $ 6.2 us-gaap_RestructuringCharges | $ 4.0 us-gaap_RestructuringCharges | $ 1.8 us-gaap_RestructuringCharges | $ 0 us-gaap_RestructuringCharges | $ 0.3 us-gaap_RestructuringCharges | $ 0.5 us-gaap_RestructuringCharges | $ 0.8 us-gaap_RestructuringCharges | $ 0 us-gaap_RestructuringCharges | $ 12.0 us-gaap_RestructuringCharges | $ 1.6 us-gaap_RestructuringCharges
Restructuring Reserve | 6.9 us-gaap_RestructuringReserve |  |  |  | 0 us-gaap_RestructuringReserve |  |  |  | 6.9 us-gaap_RestructuringReserve | 0 us-gaap_RestructuringReserve
Americas |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Number of branches closed |  |  |  |  |  |  |  |  | 52 kelya_RestructuringandRelatedCostNumberofBranchesClosed / us-gaap_StatementBusinessSegmentsAxis = kelya_Americas1Member |
Corporate |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges included in SG&A expenses |  |  |  |  |  |  |  |  | 9.9 us-gaap_RestructuringCharges / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |
2014 Management Simplification Restructuring Plan |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges included in SG&A expenses |  |  |  |  |  |  |  |  | 9.9 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = kelya_A2014ManagementSimplificationRestructuringPlanMember |
2014 Management Simplification Restructuring Plan | SG&A Expenses |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Number of positions eliminated |  |  |  |  |  |  |  |  | 112 us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember / us-gaap_RestructuringPlanAxis = kelya_A2014ManagementSimplificationRestructuringPlanMember |
2014 Management Simplification Restructuring Plan | Americas |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges included in SG&A expenses |  |  |  |  |  |  |  |  | 4.0 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = kelya_A2014ManagementSimplificationRestructuringPlanMember / us-gaap_StatementBusinessSegmentsAxis = kelya_Americas1Member |
2014 Management Simplification Restructuring Plan | Americas | SG&A Expenses |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Number of positions eliminated |  |  |  |  |  |  |  |  | 40 us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember / us-gaap_RestructuringPlanAxis = kelya_A2014ManagementSimplificationRestructuringPlanMember / us-gaap_StatementBusinessSegmentsAxis = kelya_Americas1Member |
2014 Management Simplification Restructuring Plan | OCG |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges included in SG&A expenses |  |  |  |  |  |  |  |  | 1.3 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = kelya_A2014ManagementSimplificationRestructuringPlanMember / us-gaap_StatementBusinessSegmentsAxis = kelya_OCGMember |
2014 Management Simplification Restructuring Plan | OCG | SG&A Expenses |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Number of positions eliminated |  |  |  |  |  |  |  |  | 8 us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember / us-gaap_RestructuringPlanAxis = kelya_A2014ManagementSimplificationRestructuringPlanMember / us-gaap_StatementBusinessSegmentsAxis = kelya_OCGMember |
2014 Management Simplification Restructuring Plan | Corporate |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges included in SG&A expenses |  |  |  |  |  |  |  |  | $ 4.6 us-gaap_RestructuringCharges / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember / us-gaap_RestructuringPlanAxis = kelya_A2014ManagementSimplificationRestructuringPlanMember |
2014 Management Simplification Restructuring Plan | Corporate | SG&A Expenses |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Number of positions eliminated |  |  |  |  |  |  |  |  | 64 us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember / us-gaap_RestructuringPlanAxis = kelya_A2014ManagementSimplificationRestructuringPlanMember |
Number of positions eliminated recognized as a one-time benefit |  |  |  |  |  |  |  |  | 53 kelya_RestructuringandRelatedCostNumberofPositionsEliminatedOneTimeBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember / us-gaap_RestructuringPlanAxis = kelya_A2014ManagementSimplificationRestructuringPlanMember |
Number of positions eliminated recognized as contract termination costs |  |  |  |  |  |  |  |  | 11 kelya_RestructuringandRelatedCostNumberofPositionsEliminatedContractTermination / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember / us-gaap_RestructuringPlanAxis = kelya_A2014ManagementSimplificationRestructuringPlanMember |

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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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