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Basis of Presentation - Additional Information (Detail) | 3 Months Ended | 4 Months Ended | 9 Months Ended | 12 Months Ended |  |
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Oct. 04, 2025 USD ($) | Jul. 12, 2025 USD ($) | Oct. 05, 2024 USD ($) | Jul. 13, 2024 USD ($) | Dec. 30, 2023 USD ($) | Apr. 19, 2025 USD ($) | Apr. 20, 2024 USD ($) | Oct. 04, 2025 USD ($) Segment | Oct. 05, 2024 USD ($) | Dec. 28, 2024 USD ($) | Jul. 15, 2023 USD ($) | Jul. 16, 2022 USD ($)
Basis of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | Segment |  |  |  |  |  |  |  | 1 |  |  |  |
Segment reporting, description |  |  |  |  |  |  |  | The company has identified two operating segments based on how business activities are managed and evaluated, legacy Flowers Foods and Simple Mills. Simple Mills qualifies as an operating segment as it meets the criteria of being a business and has discrete financial information available that is regularly reviewed by the chief executive officer (the "CEO"), who is the chief operating decision maker (the "CODM"), to assess the performance and allocate resources. As Simple Mills shares similar economic characteristics with legacy Flowers Foods, we aggregate Simple Mills and legacy Flowers Foods as one operating segment for the purpose of determining our one reportable segment. |  |  |  |
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] |  |  |  |  |  |  |  | srt:ChiefExecutiveOfficerMember |  |  |  |
Number of reportable segments | Segment |  |  |  |  |  |  |  | 1 |  |  |  |
Investment in unconsolidated affiliate | $ 1,481,000 |  |  |  |  |  |  | $ 1,481,000 |  | $ 1,481,000 |  |
Fair value of investment in unconsolidated affiliate |  |  | $ 1,500,000 |  |  |  | $ 1,500,000 |  | $ 1,500,000 |  |  |
Asset impairment charges and equipment relocation costs |  |  |  | $ 1,400,000 |  |  |  | 5,495,000 | 9,864,000 |  |  |
Impairment charge |  | $ 0 |  |  |  |  |  |  |  |  |  |
Recovery related to the sale of equipment |  |  |  |  |  |  |  | 577,000 | 2,040,000 |  |  |
Investment impairment loss |  |  |  |  | $ 5,500,000 |  | $ 4,000,000 |  |  |  |  |
Business Process Improvement Cost | $ 949,000 |  | 490,000 |  |  |  |  | $ 2,311,000 | $ 5,779,000 |  |  |
ERP Related Software |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges and equipment relocation costs |  |  | 2,300,000 |  |  |  |  |  |  |  |  |
Recovery related to the sale of equipment |  |  | 1,300,000 |  |  |  |  |  |  |  |  |
Bailey Street Bakery |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Severance costs |  |  |  |  |  | $ 1,300,000 |  |  |  |  |  |
Asset impairment charges and equipment relocation costs |  |  |  |  |  | $ 6,100,000 |  |  |  |  |  |
Baton Rouge, Louisiana Bakery |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Severance costs |  |  | 1,100,000 |  |  |  |  |  |  |  |  |
Asset impairment charges and equipment relocation costs |  |  | $ 2,400 |  |  |  |  |  |  |  |  |
Outstanding Trade Receivables | Wal-Mart/Sam's Club | Customer Concentration Risk |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  |  |  | 19.10% |  | 18.40% |  |
Initial Investment |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of investment in unconsolidated affiliate |  |  |  |  |  |  |  |  |  |  |  | $ 9,000,000
Second Investment |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of investment in unconsolidated affiliate |  |  |  |  |  |  |  |  |  |  | $ 2,000,000 |

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