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Other Income (Expense), Net - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Apr. 03, 2022
Dec. 31, 2023
Jan. 01, 2023
Jan. 02, 2022
Other Income and Expense [Line Items]        
Interest Income, Money Market Deposits   $ 3.0    
Gain on foreign currency remeasurement   0.0 $ 5.5 $ 0.0
Kelly Services Japan, Inc.        
Other Income and Expense [Line Items]        
Gain on foreign currency remeasurement $ 5.5   $ 5.5  
Business Talent Group, LLC        
Other Income and Expense [Line Items]        
Proceeds from (investment in) equity securities, investing activities   $ 2.0