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Summary Of Significant Accounting Policies - Additional Information (Detail)			3 Months Ended							4 Months Ended		12 Months Ended
	Sep. 28, 2016 USD ($)	Apr. 03, 2012 USD ($)	Jan. 02, 2021 USD ($)	Oct. 03, 2020 USD ($)	Jul. 11, 2020 USD ($) Bakery	Dec. 28, 2019 USD ($)	Oct. 05, 2019 USD ($)	Jul. 13, 2019 USD ($)	Dec. 29, 2018 USD ($)	Apr. 18, 2020 USD ($) Bakery	Apr. 20, 2019 USD ($)	Jan. 02, 2021 USD ($) Segment Bakery	Dec. 28, 2019 USD ($)	Dec. 29, 2018 USD ($)	Dec. 30, 2017
Significant Accounting Policies [Line Items]
Sales			$ 1,023,036,000	$ 989,650,000	$ 1,025,861,000	$ 917,759,000	$ 966,561,000	$ 975,759,000		$ 1,349,444,000	$ 1,263,895,000	$ 4,387,991,000	$ 4,123,974,000	$ 3,951,852,000
Deferred gain on sale of assets held for sale			23,900,000			30,200,000						23,900,000	30,200,000
Net gain on sale of distribution rights												5,100,000	4,100,000	4,400,000
Equipment held under capital leases									$ 35,400,000					35,400,000
Total accumulated depreciation for assets held under capital leases									13,400,000					13,400,000
Capitalized interest			0			0			0			0	0	0
Operating lease right-of-use assets			328,712,000			376,473,000						328,712,000	376,473,000
Operating lease liabilities			340,403,000									$ 340,403,000
Lessee, operating lease, existence of residual value guarantees												false
Lessee, operating lease, residual value guarantees, description												Additionally, these contracts do not contain residual value guarantees, and there are no other restrictions or covenants in the contracts.
Financing ROU assets			5,419,000			22,829,000						$ 5,419,000	22,829,000
Financing right-of-use lease liabilities			5,359,000									5,359,000
Gain on termination of embedded leases												$ 14,817,000	1,248,000
Number of operating segments | Segment												1
Number of closed bakeries reclassified as held for sale | Bakery					3					2		3
Impairment charges assets held for sale			1,300,000		$ 4,200,000							$ 23,627,000	$ 21,062,000	5,593,000
Gain at time of sale			(1,400,000)
Asset impairment charges														5,999,000
Finite-lived intangible asset amortization periods													33 years
Goodwill impairment loss												0	$ 0	0
Advertising and marketing costs												60,400,000	48,200,000	40,500,000
Capitalized software development costs			21,900,000			29,600,000						21,900,000	29,600,000
Amortization expense of capitalized software development costs												$ 9,300,000	$ 10,200,000	$ 8,000,000.0
Corporate income tax rate												21.00%	21.00%	21.00%	35.00%
Reclassify the stranded income tax effects from AOCI to retained earnings												$ 18,800,000
Debt instrument face amount			800,000,000			803,750,000						800,000,000	$ 803,750,000
Research and development costs												4,000,000.0	4,300,000	$ 4,900,000
3.5% Senior Notes Due 2026
Significant Accounting Policies [Line Items]
Debt instrument face amount	$ 400,000,000.0		400,000,000			400,000,000						400,000,000	400,000,000
Debt instrument discount and issuance cost amortization period	10 years
4.375% Senior Notes Due 2022
Significant Accounting Policies [Line Items]
Debt instrument face amount		$ 400,000,000.0	400,000,000			400,000,000						400,000,000	400,000,000
Debt instrument discount and issuance cost amortization period		10 years
Trademarks
Significant Accounting Policies [Line Items]
Restructuring impairment charges of indefinite intangible assets													15,400,000	0
Impairment of Trademark
Significant Accounting Policies [Line Items]
Impairment charge			1,300,000		4,600,000
Property, Plant and Equipment
Significant Accounting Policies [Line Items]
Asset impairment charges														3,516,000
Facility Closing
Significant Accounting Policies [Line Items]
Asset impairment charges									700,000					700,000
Brattleboro, Vermont | Bakery Closing
Significant Accounting Policies [Line Items]
Impairment charge of long-lived assets held for use									500,000
Brattleboro, Vermont | Bakery Closing | Property, Plant and Equipment
Significant Accounting Policies [Line Items]
Facility closure cost									2,500,000
Bakeries
Significant Accounting Policies [Line Items]
Impairment charges assets held for sale					5,700,000							5,700,000
Line Closures and Office Building
Significant Accounting Policies [Line Items]
Impairment charges assets held for sale												600,000
Spare Parts
Significant Accounting Policies [Line Items]
Impairment charges assets held for sale					$ 700,000							$ 700,000
Spare Parts | Winston-Salem, North Carolina | Facility Closing
Significant Accounting Policies [Line Items]
Facility closure cost									200,000
Spare Parts | Brattleboro, Vermont | Bakery Closing
Significant Accounting Policies [Line Items]
Facility closure cost									200,000
Spare Parts | Winston-Salem, North Carolina | Facility Closing
Significant Accounting Policies [Line Items]
Facility closure cost									$ 200,000
Manufacturing Lines
Significant Accounting Policies [Line Items]
Impairment charges assets held for sale											$ 400,000
Closed Plant
Significant Accounting Policies [Line Items]
Proceeds from sale of assets held for sale							1,900,000
Gain at time of sale							800,000
Closed Plant | Winston-Salem, North Carolina
Significant Accounting Policies [Line Items]
Impairment charges assets held for sale								1,300,000
Additional impairment charge of spare parts write-offs							200,000
Closed Plant | Opelika, Alabama
Significant Accounting Policies [Line Items]
Impairment charges assets held for sale							$ 3,900,000	$ 1,300,000
Bakery Equipment
Significant Accounting Policies [Line Items]
Lessee, operating lease term												less than a year up to nine years
Transportation Equipment
Significant Accounting Policies [Line Items]
Lessee, operating lease term												less than one year up to seven years
IT Equipment
Significant Accounting Policies [Line Items]
Lessee, operating lease term												less than a year up to five years
Certain Equipment and IT Equipment
Significant Accounting Policies [Line Items]
Lessee, operating lease term												shorter than a year
Buildings and Land
Significant Accounting Policies [Line Items]
Lessee, operating lease, existence of residual value guarantees												false
Lessee, operating lease, residual value guarantees, description												Additionally, these contracts do not contain residual value guarantees, and there are no other restrictions or covenants in the contracts.
Short Term Leases
Significant Accounting Policies [Line Items]
Lessee, operating lease, existence of residual value guarantees												false
Lessee, operating lease, residual value guarantees, description												do not contain residual value guarantees, and there are no other restrictions or covenants in the leases.
Lessee, operating lease, purchase options												false
Lessee, operating lease, option to extend, description												There are no purchase options present, however, there generally are renewals that could extend lease terms for additional periods.
Embedded Financing Truck And Trailer Leases
Significant Accounting Policies [Line Items]
Financing ROU assets			0			16,100,000						$ 0	16,100,000
Financing right-of-use lease liabilities			0			20,900,000						0	20,900,000
Gain on termination of embedded leases												4,100,000
Embedded Financing I T Equipment
Significant Accounting Policies [Line Items]
Financing ROU assets			4,600,000			5,700,000						4,600,000	5,700,000
Financing right-of-use lease liabilities			$ 4,600,000			5,800,000						$ 4,600,000	5,800,000
Accounting Standards Update 2016-02
Significant Accounting Policies [Line Items]
Operating lease right-of-use assets						387,300,000							387,300,000
Operating lease liabilities						$ 391,900,000							391,900,000
Minimum
Significant Accounting Policies [Line Items]
Lessee, operating lease term			1 year									1 year
Lessee, operating lease renewal term			1 month									1 month
Finite-lived intangible asset amortization periods												2 years
Minimum | Trademarks
Significant Accounting Policies [Line Items]
Finite-lived intangible asset amortization periods												30 years
Minimum | Short Term Leases
Significant Accounting Policies [Line Items]
Lessee, operating lease term			1 month									1 month
Minimum | Capitalized Software Development Costs
Significant Accounting Policies [Line Items]
Estimated useful life, years												3 years
Maximum
Significant Accounting Policies [Line Items]
Lessee, operating lease term			22 years									22 years
Lessee, operating lease renewal term			10 years									10 years
Finite-lived intangible asset amortization periods												40 years
Maximum | Trademarks
Significant Accounting Policies [Line Items]
Finite-lived intangible asset amortization periods												40 years
Maximum | Bakery Equipment
Significant Accounting Policies [Line Items]
Lessee, operating lease term			9 years									9 years
Maximum | Transportation Equipment
Significant Accounting Policies [Line Items]
Lessee, operating lease term			7 years									7 years
Maximum | IT Equipment
Significant Accounting Policies [Line Items]
Lessee, operating lease term			5 years									5 years
Maximum | Short Term Leases
Significant Accounting Policies [Line Items]
Lessee, operating lease term			12 months									12 months
Maximum | Capitalized Software Development Costs
Significant Accounting Policies [Line Items]
Estimated useful life, years												8 years
Direct Financing To Distributor | Maximum
Significant Accounting Policies [Line Items]
Notes receivable maturity period												10 years
Shipping costs
Significant Accounting Policies [Line Items]
Shipping costs												$ 1,075,800,000	$ 1,010,500,000	$ 975,100,000
Customer Concentration Risk | Outstanding Trade Receivables | Wal-Mart/Sam's Club
Significant Accounting Policies [Line Items]
Concentration risk percentage												18.80%	18.90%
Customer Concentration Risk | Total year to date sales | Top 10 Customers
Significant Accounting Policies [Line Items]
Concentration risk percentage												53.60%	51.00%	50.30%
Customer Concentration Risk | Total year to date sales | Wal-Mart/Sam's Club
Significant Accounting Policies [Line Items]
Concentration risk percentage												21.20%	21.10%	20.30%
Scan-Based Trading
Significant Accounting Policies [Line Items]
Sales												$ 2,300,000,000	$ 1,900,000,000	$ 1,700,000,000

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