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Basis of Presentation - Additional Information (Detail) - Segment | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 16, 2016 | Jul. 18, 2015 | Jul. 16, 2016 | Jul. 18, 2015 | Jan. 02, 2016
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 bakeries 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 Southeast, Mid-Atlantic, New England, Southwest, California and select markets in Nevada, the Midwest and the Pacific Northwest. The Warehouse Segment (16% of total year to date sales) currently operates ten bakeries that produce snack cakes, breads and rolls for national retail, foodservice, vending, and co-pack customers and deliver through customers’ warehouse channels. The Warehouse Segment also operates one baking ingredient mix facility |  |
Number of business segments |  |  | 2 |  |
Total year to date sales | Customer Concentration Risk | Wal-Mart/Sam's Club |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |
Concentration risk percentage | 20.20% | 19.70% | 19.60% | 19.50% |
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 | 17.60% | 17.20% | 16.90% | 17.00% |
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 | 2.60% | 2.50% | 2.70% | 2.50% |
Outstanding Trade Receivables | Customer Concentration Risk | Wal-Mart/Sam's Club |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |
Concentration risk percentage |  |  | 20.70% |  | 18.90%

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