Loss Reclassified from Accumulated Other Comprehensive Income for Commodity Contracts (Detail) - USD ($) $ in Thousands	4 Months Ended
	Apr. 23, 2016	Apr. 25, 2015
Accumulated Other Comprehensive Income Loss [Line Items]
Net of tax	$ (1,143)	$ (1,587)
Commodity Contract
Accumulated Other Comprehensive Income Loss [Line Items]
Gross loss reclassified from AOCI into income	1,782	2,504
Tax benefit	(686)	(964)
Net of tax	$ 1,096	$ 1,540