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Sale of Assets - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2019 | Jul. 01, 2018
Sale of Assets [Line Items] |  |  |
Proceeds from sale of assets |  | $ 13.8 | $ 0.0
Land |  |  |
Sale of Assets [Line Items] |  |  |
Proceeds from sale of assets | $ 11.7 |  |
Transfer of customer contracts |  |  |
Sale of Assets [Line Items] |  |  |
Proceeds from sale of assets | $ 2.1 |  |

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- Definition [Line Items] for Sale of Assets [Table] + References No definition available. + Details
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Namespace Prefix: | kelya_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration

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- Details
Name: | kelya_SaleofAssetsAxis=us-gaap_LandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | kelya_SaleofAssetsAxis=kelya_TransferofCustomerContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |