Inventories - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
Inventory Disclosure [Abstract]
LIFO inventory amount	$ 61.1	$ 53.2
Effect of LIFO Inventory Liquidation on Income	4.6
Excess of FIFO over LIFO value	$ 11.8	$ 16.4