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Summary of AOCI exclusive of reclassification (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Accumulated Other Comprehensive Income Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI, Current year, net of tax	$ (9,426)	$ 1,717	$ (6,732)
Derivative Instruments
Accumulated Other Comprehensive Income Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI, Derivative instruments before tax	(9,734)	9,316	(6,821)
Amount of Gain (Loss) Recognized in AOCI, Derivative instruments tax benefit	2,945	(3,586)	2,626
Amount of Gain (Loss) Recognized in AOCI, Derivative instruments net of tax	(6,789)	5,730	(4,195)
Amount of Gain (Loss) Recognized in AOCI, Current year, net of tax	(6,789)	5,730
Current Year Actuarial Loss
Accumulated Other Comprehensive Income Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI, Current year, before tax	(4,307)	(6,525)	2,075
Current Year Prior Service Cost
Accumulated Other Comprehensive Income Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI, Current year, before tax			(6,199)
Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI, Current year, before tax	(4,307)	(6,525)	(4,124)
Amount of Gain (Loss) Recognized in AOCI, Current year, tax benefit	1,670	2,512	1,587
Amount of Gain (Loss) Recognized in AOCI, Current year, net of tax	(2,637)	(4,013)	(2,537)
Interest Rate Contracts | Derivative Instruments
Accumulated Other Comprehensive Income Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI, Derivative instruments before tax		1,083
Commodity Contract | Derivative Instruments
Accumulated Other Comprehensive Income Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI, Derivative instruments before tax	$ (9,734)	$ 8,233	$ (6,821)

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Amount before tax and reclassification adjustments of other comprehensive income (loss).

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount of tax expense (benefit) allocated to other comprehensive income (loss) before reclassification adjustment from accumulated other comprehensive income (loss).

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