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Investment in PersolKelly Pte Ltd. (Details) - USD ($)		3 Months Ended			9 Months Ended
	Apr. 01, 2020	Jan. 03, 2021	Sep. 27, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 2019	Dec. 29, 2019	Dec. 30, 2018
Schedule of Equity Method Investments [Line Items]
Equity in net earnings (loss) of affiliate			$ 1,800,000	$ (900,000)	$ (1,000,000.0)	$ (1,000,000.0)
Investment in equity affiliate			$ 115,600,000		$ 115,600,000		$ 117,200,000
PersolKelly Pte. Ltd.
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage			49.00%		49.00%
Due from PersolKelly Pte. Ltd.			$ 10,900,000		$ 10,900,000		$ 10,900,000
Advances to PersolKelly Pte. Ltd.				$ 4,400,000		$ 4,400,000		$ 7,000,000.0
PersolKelly Pte. Ltd. | Prepaid Expenses and Other Current Assets
Schedule of Equity Method Investments [Line Items]
Advances to PersolKelly Pte. Ltd.			$ 5,600,000		$ 5,600,000
PersolKelly Pte. Ltd. | Subsequent Event [Member]
Schedule of Equity Method Investments [Line Items]
Repayment of Notes Receivable from Related Parties		$ 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
Joint Venture | Kelly Services Australia Pty Ltd and Kelly Services (New Zealand) Limited
Schedule of Equity Method Investments [Line Items]
Ownership percentage sold	100.00%
Proceeds from sale of equity method investments	$ 17,500,000

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