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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 | 6 Months Ended
--- | --- | ---
Jul. 14, 2018 | Jul. 15, 2017 | Jul. 14, 2018 | Jul. 15, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Amount of Gain or (Loss) Recognized in AOCI on Derivatives(Effective Portion) | [1] | $ (8,809) | $ 7,238 | $ 1,661 | $ 3,720
Production costs |  | 488,871 | 468,246 | 1,113,993 | 1,076,314
Income before income taxes |  | 49,779 | 66,888 | 119,560 | 161,965
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Income before income taxes | [2] | 126 | 320 | 423 | 794
Interest Rate Contracts | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Interest expense | [2] | 25 | 20 | 58 | 47
Commodity Contract |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Amount of Gain or (Loss) Recognized in AOCI on Derivatives(Effective Portion) | [1] | (8,809) | 7,238 | 1,661 | 3,720
Commodity Contract | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Production costs | [2],[3] | $ 101 | $ 300 | $ 365 | $ 747
[1] | Amounts in parentheses indicate debits to determine net income (loss).
[2] | Amounts in parentheses, if any, indicate credits to determine net income (loss).
[3] | Included in materials, supplies, labor and other production costs (exclusive of depreciation and amortization shown separately).

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