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Assets Held for Sale - Narrative (Details) - USD ($) $ in Millions	Jan. 03, 2021	Dec. 29, 2019
Assets Held for Sale [Abstract]
Properties held for sale	$ 0.0	$ 21.2

X

- Definition

Assets Held for Sale [Abstract]

+ References

No definition available.

+ Details

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Namespace Prefix:	kelya_
Data Type:	xbrli:stringItemType
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X

- Definition

Amount of assets held-for-sale that are not part of a disposal group.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 15
-Paragraph 4
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=121558832&loc=d3e400-110220

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant