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Net Fair Value of Commodity Price Risk (Detail) - USD ($) $ in Thousands	Jul. 15, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Assets	$ 6,409	$ 1,611
Liabilities	(127)	(2,435)
Net Fair Value	6,282	(824)
Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Assets	6,409	1,611
Liabilities	(127)	(2,435)
Net Fair Value	6,282	(824)
Other Current Assets
Derivative Instruments, Gain (Loss) [Line Items]
Assets	6,245	1,576
Other Current Assets | Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Assets	6,245	1,576
Other LongTerm Assets
Derivative Instruments, Gain (Loss) [Line Items]
Assets	164	35
Other LongTerm Assets | Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Assets	164	35
Other Current Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Liabilities		(2,435)
Other Current Liabilities | Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Liabilities		$ (2,435)
Other LongTerm Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Liabilities	(127)
Other LongTerm Liabilities | Level 1
Derivative Instruments, Gain (Loss) [Line Items]
Liabilities	$ (127)

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Fair value as of the balance sheet date of all price risk derivative assets designated as cash flow hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
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