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Investment in PersolKelly Pte Ltd. (Details)
$ in Millions
3 Months Ended 9 Months Ended
Apr. 01, 2020
USD ($)
Oct. 03, 2021
USD ($)
geography
Jul. 04, 2021
USD ($)
Sep. 27, 2020
USD ($)
Oct. 03, 2021
USD ($)
geography
Sep. 27, 2020
USD ($)
Jan. 03, 2021
USD ($)
Schedule of Equity Method Investments [Line Items]              
Number of geographies in which entity operates | geography   10     10    
Equity in net earnings (loss) of affiliate   $ 1.7   $ 1.8 $ 2.3 $ (1.0)  
Investment in equity affiliate   $ 122.0     $ 122.0   $ 118.5
PersolKelly Pte. Ltd.              
Schedule of Equity Method Investments [Line Items]              
Equity method investment, ownership percentage   49.00%     49.00%    
Due from PersolKelly Pte. Ltd.             $ 5.6
Proceeds from collection of (payments to fund) long-term loans to related parties     $ 5.8        
Kelly Services Australia Pty Ltd and Kelly Services (New Zealand) Limited              
Schedule of Equity Method Investments [Line Items]              
Proceeds from royalties received $ 0.7            
Kelly Services Australia Pty Ltd and Kelly Services (New Zealand) Limited | Joint Venture              
Schedule of Equity Method Investments [Line Items]              
Ownership percentage sold 100.00%            
Proceeds from sale of equity method investments $ 17.5