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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions		3 Months Ended						12 Months Ended
	Feb. 15, 2022	Jan. 01, 2023	Oct. 02, 2022	Apr. 03, 2022	Oct. 03, 2021	Jul. 04, 2021	Apr. 04, 2021	Jan. 01, 2023	Jan. 02, 2022	Jan. 03, 2021	Mar. 07, 2022	Feb. 14, 2022	Mar. 08, 2021	Nov. 18, 2020	Aug. 18, 2020	Jan. 14, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payment for contingent consideration liability, financing activities								$ 3.3	$ 1.6	$ 0.0
Equity securities, FV-NI and without readily determinable fair value		$ 6.4						6.4
Proceeds from sale of Persol Holdings investment								196.9	0.0	0.0
Goodwill impairment charge		$ 10.3	$ 30.7					$ 41.0	0.0	147.7
PersolKelly Pte. Ltd.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners		2.50%						2.50%
PersolKelly Pte. Ltd.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities, FV-NI and without readily determinable fair value		$ 6.4						$ 6.4
Brazil
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Disposition, increase (decrease) to indemnification liabilities								0.8
Disposition, indemnification liabilities, expense								0.2
Brazil | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Disposition, indemnification liabilities		8.8						8.8
Brazil
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Indemnification liability															$ 2.5
Greenwood/Asher
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration, liability		3.3						3.3						$ 2.1
Payment for contingent consideration liability				$ 2.3
Payment for contingent consideration liability, financing activities				0.7
Expense related to earnout liability								1.0	2.5
Insight
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration, liability																$ 1.6
Payment for contingent consideration liability					$ 1.8
Payment for contingent consideration liability, financing activities									1.6
Expense related to earnout liability									0.1	0.1
RocketPower
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration, liability											$ 0.6
Possible future contingent consideration											31.8
Goodwill impairment charge								41.0
Persol Holdings Investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost of equity securities									$ 18.0
Proceeds from sale of Persol Holdings investment	$ 196.9
Business Talent Group, LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Proceeds from sale of Persol Holdings investment						$ 5.0
Kenzie Academy Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities, FV-NI and without readily determinable fair value													$ 1.4
Debt and equity securities, realized gain (loss)							$ (1.4)
PersolKelly Pte. Ltd.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity method investment, ownership percentage									49.00%			49.00%
Equity securities, FV-NI and without readily determinable fair value		6.4						6.4
Other Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds		8.6						8.6	$ 6.5
Level 3 | Brazil
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Disposition, indemnification liabilities		3.4						3.4	2.4
Level 3 | Greenwood/Asher
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration, liability		3.3						3.3	4.6
Payment for contingent consideration liability				$ 2.3
Level 3 | Insight
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration, liability										$ 1.7
Level 3 | RocketPower
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration, liability		0.0						0.0			0.6
Level 3 | Other Long Term Liabilities | Brazil
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Disposition, indemnification liabilities		3.1						3.1
Level 3 | Other Long Term Liabilities | Greenwood/Asher
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration, liability									2.3
Level 3 | Other Long Term Liabilities | RocketPower
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration, liability											0.1
Possible future contingent consideration		31.8						31.8
Level 3 | Accounts Payable and Accrued Liabilities | Brazil
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Disposition, indemnification liabilities		$ 0.3						$ 0.3
Level 3 | Accounts Payable and Accrued Liabilities | Greenwood/Asher
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration, liability									$ 2.3
Level 3 | Accounts Payable and Accrued Liabilities | RocketPower
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration, liability											$ 0.5

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