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Net Fair Value of Commodity Price Risk (Detail) - USD ($) $ in Thousands | Oct. 06, 2018 | Dec. 30, 2017
--- | --- | ---
Derivative Instruments, Gain (Loss) [Line Items] |  |
Assets | $ 4,489 | $ 291
Liabilities | (1,796) | (10,886)
Net Fair Value | 2,693 | (10,595)
Level 1 |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Assets | 4,489 | 291
Liabilities | (1,796) | (10,886)
Net Fair Value | 2,693 | (10,595)
Other Current Assets |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Assets | 3,872 | 259
Other Current Assets | Level 1 |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Assets | 3,872 | 259
Other LongTerm Assets |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Assets | 617 | 32
Liabilities |  | (639)
Other LongTerm Assets | Level 1 |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Assets | 617 | 32
Liabilities |  | (639)
Other Current Liabilities |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Liabilities | (1,180) | (10,247)
Other Current Liabilities | Level 1 |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Liabilities | (1,180) | $ (10,247)
Other LongTerm Liabilities |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Liabilities | (616) |
Other LongTerm Liabilities | Level 1 |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Liabilities | $ (616) |

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