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Investment in PersolKelly Pte Ltd. (Details) $ in Millions		3 Months Ended		6 Months Ended
	Apr. 01, 2020 USD ($)	Jul. 04, 2021 USD ($) geography	Jun. 28, 2020 USD ($)	Jul. 04, 2021 USD ($) geography	Jun. 28, 2020 USD ($)	Jan. 03, 2021 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of geographies in which entity operates | geography		10		10
Equity in net earnings (loss) of affiliate		$ 1.7	$ (1.3)	$ 0.6	$ (2.8)
Investment in equity affiliate		$ 120.0		$ 120.0		$ 118.5
PersolKelly Pte. Ltd.
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage		49.00%		49.00%
Due from PersolKelly Pte. Ltd.						$ 5.6
Proceeds from collection of (payments to fund) long-term loans to related parties		$ 5.8
Kelly Services Australia Pty Ltd and Kelly Services (New Zealand) Limited
Schedule of Equity Method Investments [Line Items]
Proceeds from royalties received	$ 0.7
Kelly Services Australia Pty Ltd and Kelly Services (New Zealand) Limited | Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership percentage sold	100.00%
Proceeds from sale of equity method investments	$ 17.5

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