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Basis of Presentation - Additional Information (Detail) $ in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
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May 03, 2017 BusinessUnit | Jul. 14, 2018 | Jul. 15, 2017 | Jul. 14, 2018 USD ($) Segment | Jul. 15, 2017 | Dec. 30, 2017
Basis of Presentation [Line Items] |  |  |  |  |  |
Segment reporting, description |  |  |  | SEGMENTS — Flowers Foods currently operates two business segments: a direct-store-delivery (“DSD”) segment (“DSD Segment”) and a warehouse delivery segment (“Warehouse Segment”). The DSD Segment (84% of total year to date sales) currently operates 39 plants that produce a wide variety of fresh bakery foods, including fresh breads, buns, rolls, tortillas, and snack cakes. These products are sold through a DSD route delivery system to retail and foodservice customers in the East, South, Southwest, California, and select markets in the Midwest, Pacific Northwest, Nevada, and Colorado. The Warehouse Segment (16% of total year to date sales) currently operates eight plants that produce snack cakes, breads and rolls for national retail, foodservice, vending, and co-pack customers and deliver through customers’ warehouse channels |  |
Number of business segments | Segment |  |  |  | 2 |  |
Number of new organizational structure business units established | BusinessUnit | 2 |  |  |  |  |
Full implementation expected period | 2019 |  |  |  |  |
Reclassify the stranded income tax effects from AOCI to retained earnings | $ |  |  |  | $ 18.8 |  |
Total year to date sales | Customer Concentration Risk | Wal-Mart/Sam's Club |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |
Concentration risk percentage |  | 20.80% | 20.60% | 20.30% | 20.10% |
Total year to date sales | Customer Concentration Risk | DSD Segment |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |
Concentration risk percentage |  |  |  | 84.00% |  |
Total year to date sales | Customer Concentration Risk | DSD Segment | Wal-Mart/Sam's Club |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |
Concentration risk percentage |  | 18.40% | 18.30% | 17.90% | 17.70% |
Total year to date sales | Customer Concentration Risk | Warehouse Segment |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |
Concentration risk percentage |  |  |  | 16.00% |  |
Total year to date sales | Customer Concentration Risk | Warehouse Segment | Wal-Mart/Sam's Club |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |
Concentration risk percentage |  | 2.40% | 2.30% | 2.40% | 2.40% |
Outstanding Trade Receivables | Customer Concentration Risk | Wal-Mart/Sam's Club |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |
Concentration risk percentage |  |  |  | 19.50% |  | 17.50%

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