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Investment in PersolKelly Kelly Pte. Ltd. - Narrative (Details)		3 Months Ended	12 Months Ended
	Apr. 01, 2020 USD ($)	Jan. 03, 2021 USD ($) country	Jan. 03, 2021 USD ($) country	Dec. 29, 2019 USD ($)	Dec. 30, 2018 USD ($)	Sep. 29, 2019 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity in net earnings (loss) of affiliate			$ 800,000	$ (3,600,000)	$ 5,200,000
Investment in equity affiliate		$ 118,500,000	$ 118,500,000	117,200,000
PersolKelly Pte. Ltd.
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage		49.00%	49.00%
Number of Countries in which Entity Operates | country		8	8
Due from PersolKelly Asia Pacific		$ 5,600,000	$ 5,600,000	$ 10,900,000
Advances to PersolKelly Asia Pacific					$ 7,000,000.0	$ 4,400,000
Repayment of loan		$ 5,600,000
Kelly Services Australia Pty Ltd and Kelly Services (New Zealand) Limited
Schedule of Equity Method Investments [Line Items]
Proceeds from Royalties Received	$ 700,000
Kelly Services Australia Pty Ltd and Kelly Services (New Zealand) Limited | Joint Venture
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage Sold	100.00%
Proceeds from sale of equity method investments	$ 17,500,000

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