Summary of Total Costs and Recoveries (Detail) - USD ($) $ in Thousands	3 Months Ended				4 Months Ended	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Oct. 06, 2018	Jul. 14, 2018	Apr. 20, 2019	Dec. 28, 2019	Dec. 29, 2018
Product Recall And Recovery Loss On Inferior Ingredients [Abstract]
Expense recognized						$ 1,785	$ 7,368
Recoveries recognized			$ (4,200)			(1,822)	(4,156)
Total (recovery) loss on ingredients	$ 376	$ 1,219	$ (1,891)	$ 3,884	$ (413)	$ (37)	$ 3,212