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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 03, 2021	Dec. 29, 2019	Dec. 30, 2018
Accounting Policies [Abstract]
Fiscal period duration	371 days	364 days	364 days
Advertising expense	$ 8.1	$ 9.4	$ 8.7
Short-term Debt [Line Items]
Accounts payable	536.8	503.6
Accrued payroll and related taxes	293.0	267.6
Liability for claims	1.0
Book overdrafts
Short-term Debt [Line Items]
Accounts payable	9.3	5.9
Accrued payroll and related taxes	$ 11.0	$ 21.9
PersolKelly Pte. Ltd.
Short-term Debt [Line Items]
Equity method investment, ownership percentage	49.00%

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Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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