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Sale of Assets - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2019	Sep. 29, 2019	Sep. 30, 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
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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=118932676&loc=d3e3179-108585

+ Details

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- Details

Name:	kelya_SaleofAssetsAxis=us-gaap_LandMember
Namespace Prefix:
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X

- Details

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