Derivative Instruments Located on Condensed Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Apr. 21, 2018	Dec. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Assets	$ 4,634	$ 291
Derivative Liabilities	1,073	10,886
Commodity Contract \| Other Current Assets
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Assets	4,071	259
Commodity Contract \| Other LongTerm Assets
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Assets	563	32
Commodity Contract \| Other Current Accrued Labilities
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Liabilities	689	10,247
Commodity Contract \| Other LongTerm Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Liabilities	$ 384	$ 639

Fair value of all asset derivatives designated as cash flow hedging instruments.

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)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

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Fair value of all liability derivatives designated as cash flow hedging instruments.

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