Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 29, 2024	Dec. 31, 2023	Jan. 01, 2023
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment charge	$ 72.8	$ 0.0	$ 41.0
Goodwill, net	304.2	151.1	151.1
Amortization of intangible assets	51.5	$ 40.1	37.1
Finite-lived intangible assets, amortization expense, next 12 months	30.1
Finite-lived intangible assets, amortization expense, year 2	29.4
Finite-lived intangible assets, amortization expense, year 3	28.8
Finite-lived intangible assets, amortization expense, year 4	27.4
Finite-lived intangible assets, amortization expense, year 5	24.8
Softworld, Inc.
Finite-Lived Intangible Assets [Line Items]
Reporting unit, percentage of fair value in excess of carrying amount		10.00%
Goodwill impairment charge	72.8
Tax benefit, impairment losses	18.4
Goodwill, net	$ 38.5
Motion Recruitment Partners, LLC (MRP)
Finite-Lived Intangible Assets [Line Items]
Reporting unit, percentage of fair value in excess of carrying amount	10.00%
Selling, General and Administrative Expenses
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 27.3	$ 20.9	$ 19.4