Basic and Diluted Earnings per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	4 Months Ended
	Apr. 20, 2019	Apr. 21, 2018
Earnings Per Share [Abstract]
Net income	$ 65,866	$ 51,247
Basic Earnings Per Common Share:
Basic weighted average shares outstanding for common stock	211,388	210,888
Basic earnings per common share	$ 0.31	$ 0.24
Diluted Earnings Per Common Share:
Add: Shares of common stock assumed issued upon exercise of stock options and vesting of restricted stock	496	423
Diluted weighted average shares outstanding for common stock	211,884	211,311
Diluted earnings per common share	$ 0.31	$ 0.24