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Restructuring Activities - Additional Information (Detail) |  |  | 3 Months Ended | 4 Months Ended | 12 Months Ended
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Jul. 02, 2018 Segment | May 03, 2017 BusinessUnit | Jan. 02, 2021 USD ($) | Jul. 11, 2020 USD ($) Bakery | Dec. 28, 2019 USD ($) | Oct. 05, 2019 USD ($) | Jul. 13, 2019 USD ($) | Apr. 18, 2020 Bakery | Apr. 20, 2019 USD ($) | Jan. 01, 2022 USD ($) Segment | Jan. 02, 2021 USD ($) Bakery | Dec. 28, 2019 USD ($)
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | Segment |  |  |  |  |  |  |  |  |  | 1 |  |  |  |
Project centennial costs |  |  |  |  |  |  |  |  |  | $ 0 | $ 15,548,000 | [1] | $ 784,000 | [1]
Impairment charges assets held for sale |  |  | $ 1,300,000 | $ 4,200,000 |  |  |  |  |  |  | $ 23,627,000 |  | 21,062,000 |
Number of closed bakeries reclassified as held for sale | Bakery |  |  |  | 3 |  |  |  | 2 |  |  | 3 |  |  |
Restructuring and related impairment charges |  |  |  |  |  |  |  |  |  | $ 0 | $ 23,627,000 |  | 20,229,000 |
RIF |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee severance charges recognized |  |  |  |  |  |  |  |  |  |  | 5,300,000 |  |  |
Bakeries |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges assets held for sale |  |  |  | $ 5,700,000 |  |  |  |  |  |  | 5,700,000 |  |  |
Spare Parts |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges assets held for sale |  |  |  | 700,000 |  |  |  |  |  |  | 700,000 |  |  |
Closed Plant | Opelika, Alabama |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges assets held for sale |  |  |  |  |  | $ 3,900,000 | $ 1,300,000 |  |  |  |  |  |  |
Employee severance charges recognized |  |  |  |  |  | $ 1,500,000 |  |  |  |  |  |  |  |
Manufacturing Lines |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges assets held for sale |  |  |  |  |  |  |  |  | $ 400,000 |  |  |  |  |
Impairment of Trademark |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge |  |  | 1,300,000 | 4,600,000 |  |  |  |  |  |  |  |  |  |
Lease Impairment Charges |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and related impairment charges |  |  |  |  |  |  |  |  |  |  | 9,397,000 |  |  |
Lease Termination Charges |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and related impairment charges |  |  |  |  |  |  |  |  |  |  | 4,077,000 |  |  |
Reorganization Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and related impairment charges |  |  |  |  |  |  |  |  |  |  |  |  | $ 253,000 |
Develop Leading Capabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | Segment | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Line and Distribution Depot Closings |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges assets held for sale |  |  |  | $ 600,000 |  |  |  |  |  |  |  |  |  |
Employee Severance | Voluntary Employee Separation Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee termination benefits |  |  |  |  |  |  |  |  |  |  | $ 2,600,000 |  |  |
Launch of Project Centennial |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ingredient and packaging impairments |  |  | $ 1,200,000 |  |  |  |  |  |  |  |  |  |  |
Additional impairment charge on certain finite-lived intangible assets |  |  |  |  | $ 15,400,000 |  |  |  |  |  |  |  |  |
Launch of Project Centennial | Develop Leading Capabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of new organizational structure business units established | BusinessUnit |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
[1] | Represents non-restructuring costs and are recorded in the selling, distribution, and administrative expenses line item of our Consolidated Statements of Income.

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