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Acquisition - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Feb. 21, 2025
Oct. 04, 2025
Jul. 12, 2025
Dec. 28, 2024
Oct. 05, 2024
Oct. 04, 2025
Oct. 05, 2024
Business Combination [Line Items]              
Acquisition and integration-related costs   $ 1,735   $ 2,000 $ 0 $ 16,370 $ 0
Additional costs related to acquisition   1,700       16,400  
Increase (Decrease) in pro forma net income attributable to flowers foods   1,600     $ (12,000) 8,500 $ (49,300)
Goodwill recorded for acquisition and not deductible for tax purposes $ 367,900            
Simple Mills              
Business Combination [Line Items]              
Business acquisition completed date Feb. 21, 2025            
Business acquisition consideration amount $ 848,585            
Percentage of outstanding membership interests 100.00%            
Goodwill adjustment     $ 19,000        
Business acquisition, cash acquired $ (38,833)            
Contributed net sales   70,700       156,400  
Net loss   $ 2,000       $ 8,300  
Simple Mills | Payable to Sellers upon Realization of Certain Tax Benefits              
Business Combination [Line Items]              
Business acquisition consideration amount $ 17,800