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Investment in PersolKelly Pte. Ltd. - Narrative (Details)
$ in Millions
3 Months Ended 12 Months Ended
Apr. 01, 2020
USD ($)
Jul. 04, 2021
USD ($)
Jan. 03, 2021
USD ($)
Jan. 02, 2022
USD ($)
country
Jan. 03, 2021
USD ($)
Dec. 29, 2019
USD ($)
Schedule of Equity Method Investments [Line Items]            
Equity in net earnings (loss) of affiliate       $ 5.4 $ 0.8 $ (3.6)
Investment in equity affiliate     $ 118.5 $ 123.4 $ 118.5  
PersolKelly Pte. Ltd.            
Schedule of Equity Method Investments [Line Items]            
Equity method investment, ownership percentage     49.00% 49.00% 49.00%  
Number of Geographies in Which Entity Operates | country       10    
Investment in equity affiliate       $ 123.4    
Due from PersolKelly Asia Pacific     $ 5.6   $ 5.6  
Proceeds from collection of long-term loans to related parties   $ 5.8        
Repayment of loan     $ 5.6      
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]            
Equity Method Investment, Ownership Percentage Sold 100.00%          
Proceeds from sale of equity method investments $ 17.5