v3.26.1
Related Party Transactions (Details) - Related Party - USD ($)
$ in Millions
Jan. 30, 2026
Jan. 09, 2026
Terence E. Adderley Revocable Trust K | Class B Common Stock | Hunt Equity Opportunities, LLC    
Related Party Transaction [Line Items]    
Sale of stock, number of shares issued in transaction (in shares) 3,039,940  
Terence E. Adderley Revocable Trust K | Kelly Services, Inc. | Class B Common Stock    
Related Party Transaction [Line Items]    
Sale of stock, percentage of ownership before transaction   92.20%
Hunt Equity Opportunities, LLC    
Related Party Transaction [Line Items]    
Sale of stock, contingent consideration, cash payment   $ 15.2
Hunt Equity Opportunities, LLC | Class B Common Stock    
Related Party Transaction [Line Items]    
Sale of stock, consideration received on transaction   106.0
Hunt Equity Opportunities, LLC | Kelly Services, Inc.    
Related Party Transaction [Line Items]    
Sale of stock, contingent consideration, minimum market capitalization   $ 1,200.0
Sale of stock, contingent consideration, market capitalization milestone period   48 months
Hunt Equity Opportunities, LLC | Kelly Services, Inc. | Class B Common Stock    
Related Party Transaction [Line Items]    
Sale of stock, percentage of ownership after transaction 92.20%