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Basis of Presentation - Additional Information (Detail) - Segment	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 08, 2016	Oct. 10, 2015	Oct. 08, 2016	Oct. 10, 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 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 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 plants 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	19.80%	19.20%	19.70%	19.40%
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	17.20%	16.70%	17.00%	16.90%
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			18.10%		18.90%

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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