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Effect of Derivative Instruments for Deferred Gains And (Losses) on Closed Contracts and Effective Portion in Fair Value on AOCI, Utilized for Risk Management Purposes (Detail) - USD ($)
$ in Thousands
3 Months Ended 4 Months Ended 12 Months Ended
Jan. 02, 2021
[1]
Oct. 03, 2020
[1]
Jul. 11, 2020
[1]
Dec. 28, 2019
[1]
Oct. 05, 2019
[1]
Jul. 13, 2019
[1]
Apr. 18, 2020
[1]
Apr. 20, 2019
[1]
Jan. 02, 2021
Dec. 28, 2019
Dec. 29, 2018
Derivative Instruments, Gain (Loss) [Line Items]                      
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion) (Net of tax)                 $ 9,298 $ 8,457 $ 2,978
Production costs $ 521,577 $ 497,659 $ 506,033 $ 485,960 $ 509,056 $ 508,552 $ 670,873 $ 652,141 2,196,142 2,155,709 2,066,828
Income before income taxes                 200,711 212,083 197,161
Reclassification out of Accumulated Other Comprehensive Income                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Income before income taxes                 (2,116) 2,664 (1,079)
Commodity Contract                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion) (Net of tax)                 9,298 8,457 2,978
Commodity Contract | Reclassification out of Accumulated Other Comprehensive Income | Product                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Production costs [2]                 (2,007) 2,771 (972)
Interest Rate Contracts | Reclassification out of Accumulated Other Comprehensive Income                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Interest (expense) income                 $ (109) $ (107) $ (107)
[1] The company does not report gross margin.  This line item presents our material, supplies, labor and other production costs (exclusive of depreciation and amortization shown separately) under an alternative presentation.
[2] Included in Materials, supplies, labor and other production costs (exclusive of depreciation and amortization shown separately).