v3.26.3
Goodwill and Indefinite-Lived Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Oct. 10, 2026
Jan. 03, 2026
Feb. 21, 2025
Goodwill And Intangible Assets Disclosure [Line Items]      
Goodwill $ 1,047,119 $ 1,047,775  
Impairment of goodwill or indefinite-lived intangible assets $ 0    
Flowers Foods      
Goodwill And Intangible Assets Disclosure [Line Items]      
Percentage of future cashflow discounted 9.50%    
Percentage of estimated fair value determined to exceed carrying value 13.80%    
Percentage of discount rate exceed 12.30%    
Percentage of reduction in forecasted EBITDA margin for future periods 1.40%    
Percentage of reduction in forecasted EBITDA margin lower for future periods 16.00%    
Goodwill $ 679,900    
Simple Mills      
Goodwill And Intangible Assets Disclosure [Line Items]      
Percentage of future cashflow discounted 8.50%    
Percentage of estimated fair value determined to exceed carrying value 7.70%    
Percentage of discount rate exceed 9.20%    
Percentage of reduction in forecasted EBITDA margin for future periods 1.80%    
Percentage of reduction in forecasted EBITDA margin lower for future periods 11.00%    
Goodwill $ 367,200   $ 367,223