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v3.25.3

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 |  |  |  |  |  |

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