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Restructuring Activities - Additional Information (Detail) $ in Thousands |  |  |  |  |  |  | 3 Months Ended | 4 Months Ended | 12 Months Ended
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Jul. 02, 2018 Segment | Sep. 25, 2017 Employee | Sep. 07, 2017 | Aug. 09, 2017 | Jul. 17, 2017 | May 03, 2017 BusinessUnit | Dec. 28, 2019 USD ($) | Oct. 05, 2019 USD ($) | Jul. 13, 2019 USD ($) | Dec. 29, 2018 USD ($) | Apr. 20, 2019 USD ($) | Dec. 28, 2019 USD ($) | Dec. 29, 2018 USD ($) Segment | Dec. 30, 2017 USD ($)
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of new organizational structure business units established | BusinessUnit |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Number of operating segments | Segment |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Restructuring and related impairment charges | [1] |  |  |  |  |  |  |  |  |  |  |  | $ 23,524 | $ 9,767 | $ 104,130
Impairment charges |  |  |  |  |  |  |  |  |  |  |  |  | 21,062 | 5,593 | 69,601
Restructuring impairment charges |  |  |  |  |  |  |  |  |  |  | $ 1,500 |  | 15,400 |  | 66,247
Property plant and equipment impairment |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,999 |
Severance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000
Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property plant and equipment impairment |  |  |  |  |  |  |  |  |  |  |  |  |  | 200 |
Property, Plant and Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and related impairment charges |  |  |  |  |  |  |  |  |  |  |  |  | 5,663 | 4,055 | 3,354
Property plant and equipment impairment |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,516 |
Manufacturing Lines |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges |  |  |  |  |  |  |  |  |  |  |  | $ 400 |  |  |
Manufacturing Lines | Opelika, Alabama |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges |  |  |  |  |  |  |  |  |  |  |  | $ 400 |  |  |
Closed Plant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of assets held for sale |  |  |  |  |  |  |  |  | $ 1,900 |  |  |  |  |  |
Gain at time of sale |  |  |  |  |  |  |  |  | 800 |  |  |  |  |  |
Closed Plant | Opelika, Alabama |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges |  |  |  |  |  |  |  |  | 3,900 | $ 1,300 |  |  |  |  |
Closed Plant | Winston-Salem, North Carolina |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional impairment charge of spare parts write-offs |  |  |  |  |  |  |  |  | $ 200 |  |  |  |  |  |
Spare Parts | Property, Plant and Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and related impairment charges |  |  |  |  |  |  |  |  |  |  |  |  | 174 | 238 |
Reorganization Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and related impairment charges | [1] |  |  |  |  |  |  |  |  |  |  |  | $ 253 | 4,209 | 1,925
Invest in Capabilities and Growth |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | Segment |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Bakery Closing | Brattleboro, Vermont |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge of long-lived assets held for use |  |  |  |  |  |  |  |  |  |  | 500 |  |  |  |
Bakery Closing | Brattleboro, Vermont | Property, Plant and Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility closure cost |  |  |  |  |  |  |  |  |  |  | 2,500 |  |  |  |
Bakery Closing | Spare Parts | Brattleboro, Vermont |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility closure cost |  |  |  |  |  |  |  |  |  |  | 200 |  |  |  |
Facility Closing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property plant and equipment impairment |  |  |  |  |  |  |  |  |  |  | 700 |  |  |  |
Facility Closing | Winston-Salem, North Carolina |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility closure cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,400
Closure of operations, description |  |  |  |  |  |  |  |  |  |  |  |  | On August 9, 2017, the company announced the closure of a snack cake plant in Winston-Salem, North Carolina. The bakery closed in November 2017. The closure costs were $4.4 million and consisted of $3.4 million for property, plant and equipment impairments and $1.0 million for employee termination benefits during fiscal 2017. An additional $0.2 million was recognized during fiscal 2018 for equipment impairments. These amounts are recorded in the restructuring and related impairment charges line item on our Consolidated Statements of Income |  |
Closing date of bakery |  |  |  |  | Nov. 30, 2017 |  |  |  |  |  |  |  |  |  |
Employee termination benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000
Facility Closing | Winston-Salem, North Carolina | Property, Plant and Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property plant and equipment impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,400
Facility Closing | Spare Parts | Winston-Salem, North Carolina |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility closure cost |  |  |  |  |  |  |  |  |  |  | $ 200 |  |  |  |
Launch of Project Centennial |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring activities, expected completion year |  |  |  |  |  |  |  |  |  |  |  |  | 2021 |  |
Additional impairment charge on certain finite-lived intangible assets |  |  |  |  |  |  |  | $ 15,400 |  |  |  |  |  |  |
Packaging impairment charge |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500 |
Launch of Project Centennial | Reduce Costs to Fuel Growth |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-restructuring consulting costs |  |  |  |  |  |  |  |  |  |  |  |  | $ 800 | 9,700 | 37,300
Launch of Project Centennial | Invest in Capabilities and Growth |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of new organizational structure business units established | BusinessUnit |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Launch of Project Centennial | Employee Severance | Voluntary Employee Separation Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voluntary employee separation incentive plan commencement date |  |  |  |  |  | Jul. 17, 2017 |  |  |  |  |  |  |  |  |
Election period closing date |  |  | Sep. 25, 2017 |  |  |  |  |  |  |  |  |  |  |  |
Approximate number of employees accepted offer | Employee |  |  | 325 |  |  |  |  |  |  |  |  |  |  |  |
Separations beginning date |  |  |  | Sep. 07, 2017 |  |  |  |  |  |  |  |  |  |  |
Restructuring charge paid |  |  |  |  |  |  |  |  |  |  |  |  |  | 24,200 | 4,600
Launch of Project Centennial | Employee Severance | Restructuring Charges | Voluntary Employee Separation Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate employee separation charge |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 29,700
Credit included in aggregate employee separation charge |  |  |  |  |  |  |  |  |  |  |  |  |  | 600 |
Launch of Project Centennial | Reinvigorate Core Business | Restructuring Charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges of trademark assets |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 66,200 |
[1] |
(1) | Presented on our Consolidated Statements of Income.

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