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Acquisition - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 4 Months Ended
Feb. 21, 2025
Dec. 28, 2024
Apr. 19, 2025
Apr. 20, 2024
Business Acquisition [Line Items]        
Acquisition related costs   $ 2,000 $ 13,764 $ 0
Additional costs related to acquisition     13,800  
Increase (Decrease) in pro forma net income attributable to flowers foods     4,400 $ (24,800)
Goodwill recorded for acquisition and not deductible for tax purposes $ 386,900      
Simple Mills        
Business Acquisition [Line Items]        
Business acquisition completed date Feb. 21, 2025      
Business acquisition consideration amount $ 848,537      
Percentage of outstanding membership interests 100.00%      
Business acquisition, cash acquired $ (38,833)      
Contributed net sales     24,300  
Net loss     $ 4,200  
Simple Mills | Payable to Sellers upon Realization of Certain Tax Benefits        
Business Acquisition [Line Items]        
Business acquisition consideration amount $ 17,800