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Net Fair Value of Commodity Price Risk (Detail) - USD ($) $ in Thousands | Jul. 14, 2018 | Dec. 30, 2017
--- | --- | ---
Derivative Instruments, Gain (Loss) [Line Items] |  |
Assets |  | $ 291
Liabilities | $ (7,865) | (10,886)
Net Fair Value | (7,865) | (10,595)
Level 1 |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Assets |  | 291
Liabilities | (7,865) | (10,886)
Net Fair Value | (7,865) | (10,595)
Other Current Assets |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Assets |  | 259
Other Current Assets | Level 1 |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Assets |  | 259
Other LongTerm Assets |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Assets |  | 32
Liabilities |  | (639)
Other LongTerm Assets | Level 1 |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Assets |  | 32
Liabilities |  | (639)
Other Current Liabilities |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Liabilities | (4,741) | (10,247)
Other Current Liabilities | Level 1 |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Liabilities | (4,741) | $ (10,247)
Other LongTerm Liabilities |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Liabilities | (3,124) |
Other LongTerm Liabilities | Level 1 |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Liabilities | $ (3,124) |

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