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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. 22, 2017 | Apr. 23, 2016
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net change in fair value of derivatives | [1] | $ (3,518) | $ 2,588
Production costs |  | 607,941 | 621,190
Income before income taxes |  | 95,077 | 92,378
Reclassification out of Accumulated Other Comprehensive Income |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Income before income taxes | [2] | 474 | 1,143
Interest Rate Contracts | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Interest expense (income) | [2] | 27 | 47
Commodity Contract |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net change in fair value of derivatives | [1] | (3,518) | 2,588
Commodity Contract | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Production costs | [2],[3] | $ 447 | $ 1,096
[1] | Amounts in parentheses indicate debits to determine net income.
[2] | Amounts in parentheses, if any, indicate credits to determine net income.
[3] | Included in materials, supplies, labor and other production costs (exclusive of depreciation and amortization shown separately).

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