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AOCI Related to Derivative Transactions (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
Closed Contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Estimated amount of derivatives to be reclassified in income from AOCI |  | (178) |
Closed Contracts | Commodity price risk derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Estimated amount of derivatives to be reclassified in income from AOCI |  | (42) |
Closed Contracts | Interest rate risk derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Estimated amount of derivatives to be reclassified in income from AOCI |  | (136) |
Expiring in 2017 |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net change in fair value of derivatives |  | (3,309) |
Expiring in 2017 | Commodity price risk derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net change in fair value of derivatives |  | (3,309) |
Expiring in 2018 |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net change in fair value of derivatives |  | (661) |
Expiring in 2018 | Commodity price risk derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net change in fair value of derivatives |  | (661) |
Expiring in 2019 |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net change in fair value of derivatives |  | 43 |
Expiring in 2019 | Commodity price risk derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net change in fair value of derivatives |  | 43 |
Closed or Expiring Over Next Three Years |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net change in fair value of derivatives |  | (4,105) |
Closed or Expiring Over Next Three Years | Commodity price risk derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net change in fair value of derivatives |  | (3,969) |
Closed or Expiring Over Next Three Years | Interest rate risk derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net change in fair value of derivatives |  | $ (136) |
[1] | Amounts in parentheses indicate debits to determine net income.

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- Definition The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings. + References No definition available. + Details
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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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