Summary of Total Costs and Recoveries (Detail) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 29, 2018	Oct. 06, 2018	Jul. 14, 2018	Dec. 29, 2018
Loss On Inferior Ingredients [Line Items]
Expense recognized during fiscal 2018				$ 7,368
Recoveries recognized during fiscal 2018		$ (4,200)		(4,156)
Total loss on ingredients	$ 1,219	$ (1,891)	$ 3,884	3,212
DSD Segment
Loss On Inferior Ingredients [Line Items]
Expense recognized during fiscal 2018				5,811
Recoveries recognized during fiscal 2018				(4,156)
Total loss on ingredients				1,655
Warehouse Segment
Loss On Inferior Ingredients [Line Items]
Expense recognized during fiscal 2018				1,557
Total loss on ingredients				$ 1,557