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AOCI Related to Derivative Transactions (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)
Closed Contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Estimated amount of derivatives to be reclassified in income from AOCI |  | (87) |
Closed Contracts | Commodity price risk derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Estimated amount of derivatives to be reclassified in income from AOCI |  | (29) |
Closed Contracts | Interest rate risk derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Estimated amount of derivatives to be reclassified in income from AOCI |  | (58) |
Expiring in 2018 |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net change in fair value of derivatives |  | 1,226 |
Expiring in 2018 | Commodity price risk derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net change in fair value of derivatives |  | 1,226 |
Expiring in 2019 |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net change in fair value of derivatives |  | 1,505 |
Expiring in 2019 | Commodity price risk derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net change in fair value of derivatives |  | 1,505 |
Expiring in 2020 |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net change in fair value of derivatives |  | (69) |
Expiring in 2020 | Commodity price risk derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net change in fair value of derivatives |  | (69) |
Closed or Expiring Over Next Three Years |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net change in fair value of derivatives |  | 2,575 |
Closed or Expiring Over Next Three Years | Commodity price risk derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net change in fair value of derivatives |  | 2,633 |
Closed or Expiring Over Next Three Years | Interest rate risk derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net change in fair value of derivatives |  | $ (58) |
[1] | Amounts in parentheses indicate debits to determine net income (loss).

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