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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended		12 Months Ended
	Jul. 04, 2021	Apr. 04, 2021	Jun. 28, 2020	Mar. 29, 2020	Jul. 04, 2021	Jun. 28, 2020	Jan. 03, 2021	Mar. 08, 2021	Nov. 18, 2020	Jan. 14, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Indemnification liabilities, expense (income)					$ (0.1)
Goodwill impairment charge	$ 0.0		$ 0.0	$ 147.7	0.0	$ 147.7
Proceeds from Sale of Equity Securities, FV-NI					5.0	$ 0.0
Insight
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Additional consideration payable										$ 1.6
Adjustment to earnout liability	0.1						$ 0.1
Greenwood/Asher
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Additional consideration payable									$ 2.1
Adjustment to earnout liability		$ (0.4)			(0.4)
Persol Holdings Investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost of equity securities	18.7				18.7		20.1
Business Talent Group, LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Proceeds from Sale of Equity Securities, FV-NI	5.0
Kenzie Academy Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities without readily determinable fair value, with changes in fair value in net income							1.4	$ 1.4
Debt and equity securities, realized gain (loss)		$ (1.4)
Other Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	6.1				6.1		5.1
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Indemnification liability	2.7				2.7		2.6
Level 3 | Insight
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Additional consideration payable	1.8				1.8		1.7
Level 3 | Greenwood/Asher
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Additional consideration payable	$ 1.7				$ 1.7		$ 2.1

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