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v2.4.1.9

Summary of Significant Accounting Policies - Property and Equipment At Cost and Depreciable Useful Lives (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 28, 2014 | Dec. 29, 2013 | Dec. 30, 2012
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment: | $ 360.0 us-gaap_PropertyPlantAndEquipmentGross | $ 350.5 us-gaap_PropertyPlantAndEquipmentGross |
Depreciation expense | 20.3 us-gaap_Depreciation | 18.4 us-gaap_Depreciation | 19.0 us-gaap_Depreciation
Land |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment: | 3.8 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember | 3.8 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember |
Work in process |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment: | 6.9 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = kelya_WorkinprocessMember | 4.4 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = kelya_WorkinprocessMember |
Buildings and improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment: | 59.7 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingAndBuildingImprovementsMember | 58.9 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingAndBuildingImprovementsMember |
Buildings and improvements | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 15 years |  |
Buildings and improvements | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 45 years |  |
Computer hardware and software |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment: | 221.7 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = kelya_ComputerhardwareandsoftwareMember | 215.7 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = kelya_ComputerhardwareandsoftwareMember |
Computer hardware and software | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 3 years |  |
Computer hardware and software | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 12 years |  |
Equipment, furniture and fixtures |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment: | 34.1 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = kelya_EquipmentfurnitureandfixturesMember | 33.6 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = kelya_EquipmentfurnitureandfixturesMember |
Estimated useful life | 5 years |  |
Leasehold improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment: | $ 33.8 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember | $ 34.1 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember |
Leasehold improvements | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 5 years |  |

X
- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + 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 + Details
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X
- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Details
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- Details
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