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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 | 4 Months Ended
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Apr. 21, 2018 | Apr. 22, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net change in fair value of derivatives | [1] | $ 10,470 | $ (3,518)
Production costs |  | 625,122 | 608,068
Income before income taxes |  | 69,781 | 95,077
Reclassification out of Accumulated Other Comprehensive Income |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Income before income taxes | [2] | 297 | 474
Interest Rate Contracts | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Interest expense | [2] | 33 | 27
Commodity Contract |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net change in fair value of derivatives | [1] | 10,470 | (3,518)
Commodity Contract | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Production costs | [2],[3] | $ 264 | $ 447
[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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