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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017	Jul. 04, 2016
Accounting Policies [Abstract]
Fiscal period duration	364 days	364 days	364 days
Advertising expense	$ 8.7	$ 7.9	$ 7.6
Short-term Debt [Line Items]
Accounts payable	540.6	537.7
Accrued payroll and related taxes	266.0	287.4
Liability for claims	1.0
Book overdrafts
Short-term Debt [Line Items]
Accounts payable	7.3	7.3
Accrued payroll and related taxes	$ 22.9	$ 18.6
PersolKelly Asia Pacific
Short-term Debt [Line Items]
Equity method investment, ownership percentage	49.00%			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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