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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
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Dec. 31, 2016 | Oct. 08, 2016 | Jul. 16, 2016 | Jan. 02, 2016 | Oct. 10, 2015 | Jul. 18, 2015 | Apr. 23, 2016 | Apr. 25, 2015 | Dec. 31, 2016 | Jan. 02, 2016 | Jan. 03, 2015
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net change in fair value of derivatives |  |  |  |  |  |  |  |  |  | $ 5,730 | $ (4,195) | $ (3,358)
Production costs |  | $ 450,462 | $ 476,760 | $ 477,955 | $ 455,939 | $ 464,045 | $ 457,253 | $ 621,190 | $ 585,916 | 2,026,367 | 1,963,153 | 1,950,633
Income before income taxes |  |  |  |  |  |  |  |  |  | 249,537 | 293,031 | 268,054
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  |  | 3,399 | 5,413 | 3,366
Interest Rate Contracts |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net change in fair value of derivatives |  |  |  |  |  |  |  |  |  | 666 |  |
Interest Rate Contracts | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest expense (income) |  |  |  |  |  |  |  |  |  | 135 | 154 | 157
Commodity Contract |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net change in fair value of derivatives |  |  |  |  |  |  |  |  |  | 5,064 | (4,195) | (3,358)
Commodity Contract | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Production costs | [1] |  |  |  |  |  |  |  |  | $ 3,264 | $ 5,259 | $ 3,209
[1] | Included in Materials, supplies, labor and other production costs (exclusive of depreciation and amortization shown separately).

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