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Effect of Derivative Instruments Located on the Condensed Consolidated Statements of Income, Utilized for Risk Management Purposes (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 16, 2016 | Jul. 18, 2015 | Jul. 16, 2016 | Jul. 18, 2015
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)(Net of tax) | [1] | $ 3,525 | $ (5,818) | $ 937 | $ (1,390)
Production costs |  | 477,955 | 457,253 | 1,099,145 | 1,043,169
Income before income taxes |  | 78,425 | 79,181 | 170,803 | 174,137
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Income before income taxes | [1] | (803) | (1,251) | (1,946) | (2,838)
Interest Rate Contracts | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Interest (expense) income | [1] | (35) | (35) | (82) | (82)
Commodity Contract |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)(Net of tax) | [1] | 3,525 | (5,818) | 937 | (1,390)
Commodity Contract | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Production costs | [1],[2] | $ (768) | $ (1,216) | $ (1,864) | $ (2,756)
[1] | Amounts in parentheses indicate debits to determine net income.
[2] | Included in materials, supplies, labor and other production costs (exclusive of depreciation and amortization shown separately).

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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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