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AOCI Related to Derivative Transactions (Detail) - USD ($) $ in Thousands | 4 Months Ended
--- | ---
Apr. 20, 2019 | Apr. 21, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net change in fair value of derivatives | [1] | $ (9,593) | $ 10,470
Closed Contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Estimated amount of derivatives to be reclassified in income from AOCI |  | 1,038 |
Closed Contracts | Commodity price risk derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Estimated amount of derivatives to be reclassified in income from AOCI |  | 990 |
Closed Contracts | Interest rate risk derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Estimated amount of derivatives to be reclassified in income from AOCI |  | 48 |
Expiring in 2019 |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net change in fair value of derivatives |  | (14,036) |
Expiring in 2019 | Commodity price risk derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net change in fair value of derivatives |  | (14,036) |
Expiring in 2020 |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net change in fair value of derivatives |  | (2,854) |
Expiring in 2020 | Commodity price risk derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net change in fair value of derivatives |  | (2,854) |
Expiring in 2021 |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net change in fair value of derivatives |  | (54) |
Expiring in 2021 | Commodity price risk derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net change in fair value of derivatives |  | (54) |
Closed or Expiring Over Next Four Years |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net change in fair value of derivatives |  | (15,906) |
Closed or Expiring Over Next Four Years | Commodity price risk derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net change in fair value of derivatives |  | (15,954) |
Closed or Expiring Over Next Four Years | Interest rate risk derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net change in fair value of derivatives |  | $ 48 |
[1] | Amounts in parentheses indicate debits to determine net income (loss).

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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80845-113994 + Details
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