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Basis of Presentation - Additional Information (Detail) $ in Millions |  | 4 Months Ended | 12 Months Ended
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May 03, 2017 BusinessUnit | Apr. 20, 2019 USD ($) | Apr. 21, 2018 | Dec. 29, 2018
Basis of Presentation [Line Items] |  |  |  |
Segment reporting, description |  | On May 3, 2017, the company announced an enhanced organizational structure designed to provide greater focus on the company’s long-term strategic objectives, emphasize brand growth and innovation in line with a national branded food company, drive enhanced accountability, and reduce costs. The new organizational structure establishes two business units (“BUs”), Fresh Packaged Bread and Snacking/Specialty, and realigns key leadership roles. The new structure also provides for centralized marketing, sales, supply chain, shared-services/administrative, and corporate strategy functions, each with clearly defined roles and responsibilities. The company has concluded that under the new organizational structure the company has one operating segment based on the nature of products the company sells, intertwined production and distribution model, the internal management structure and information that is regularly reviewed by the chief executive officer (“CEO”), who is the chief operating decision maker, for the purpose of assessing performance and allocating resources. Capital allocations, such as building a new bakery or other investments, impact both BUs, as the two BUs are so intertwined in the production of products, sales, marketing and other functions. Beginning with the first quarter of 2019, the comparative periods are presented on a consolidated basis due to the change to a single operating segment. |  |
Number of new organizational structure business units established | BusinessUnit | 2 |  |  |
Costs recognized on inferior ingredients |  | $ 1.3 |  |
Reimbursement of previously incurred costs on inferior ingredients |  | $ 1.7 |  |
Sales | Wal-Mart/Sam's Club | Customer Concentration Risk |  |  |  |
Basis of Presentation [Line Items] |  |  |  |
Concentration risk percentage |  | 20.50% | 20.00% |
Outstanding Trade Receivables | Wal-Mart/Sam's Club | Customer Concentration Risk |  |  |  |
Basis of Presentation [Line Items] |  |  |  |
Concentration risk percentage |  | 19.70% |  | 17.80%

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