v3.26.3
Acquisition - Additional Information (Detail) - USD ($)
3 Months Ended 4 Months Ended 9 Months Ended
Feb. 21, 2025
Oct. 10, 2026
Jul. 18, 2026
Oct. 04, 2025
Jul. 12, 2025
Apr. 25, 2026
Oct. 10, 2026
Oct. 04, 2025
Business Combination [Line Items]                
Acquisition and integration-related costs   $ 0 $ 0 $ 1,735,000   $ 1,900,000 $ 1,897,000 $ 16,370,000
Increase (Decrease) in pro forma net income attributable to flowers foods       1,600,000       8,500,000
Goodwill recorded for acquisition and not deductible for tax purposes $ 367,200,000              
Simple Mills                
Business Combination [Line Items]                
Business acquisition completed date Feb. 21, 2025              
Business acquisition consideration amount $ 846,238,000              
Percentage of outstanding membership interests 100.00%              
Goodwill adjustment         $ 19,000,000 $ 700,000    
Business acquisition, cash acquired $ (38,833,000)              
Contributed net sales       70,700,000       156,400,000
Net loss       $ (2,000,000)       $ (8,300,000)
Simple Mills | Payable to Sellers upon Realization of Certain Tax Benefits                
Business Combination [Line Items]                
Business acquisition consideration amount $ 15,500,000