Summary of AOCI exclusive of reclassification (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI, Derivative instruments net of tax	$ 2,978	$ (6,789)	$ 5,730
Amount of Gain (Loss) Recognized in AOCI, Current year, net of tax	(16,853)	(9,426)	1,717
Derivative Instruments
Accumulated Other Comprehensive Income Loss [Line Items]
Net change in fair value of derivatives	3,984	(9,734)	9,316
Amount of Gain (Loss) Recognized in AOCI, Derivative instruments tax benefit	(1,006)	2,945	(3,586)
Amount of Gain (Loss) Recognized in AOCI, Derivative instruments net of tax	2,978	(6,789)	5,730
Amount of Gain (Loss) Recognized in AOCI, Current year, net of tax	2,978	(6,789)
Current Year Actuarial Loss
Accumulated Other Comprehensive Income Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI, Current year, before tax	(26,528)	(4,307)	(6,525)
Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI, Current year, before tax	(26,528)	(4,307)	(6,525)
Amount of Gain (Loss) Recognized in AOCI, Current year, tax benefit	6,697	1,670	2,512
Amount of Gain (Loss) Recognized in AOCI, Current year, net of tax	(19,831)	(2,637)	(4,013)
Interest Rate Contracts
Accumulated Other Comprehensive Income Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI, Derivative instruments net of tax			666
Interest Rate Contracts | Derivative Instruments
Accumulated Other Comprehensive Income Loss [Line Items]
Net change in fair value of derivatives			1,083
Commodity Contract
Accumulated Other Comprehensive Income Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI, Derivative instruments net of tax	2,978	(6,789)	5,064
Commodity Contract | Derivative Instruments
Accumulated Other Comprehensive Income Loss [Line Items]
Net change in fair value of derivatives	$ 3,984	$ (9,734)	$ 8,233