Basic and Diluted Earnings per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						4 Months Ended		12 Months Ended
	Dec. 28, 2019	Oct. 05, 2019	Jul. 13, 2019	Dec. 29, 2018	Oct. 06, 2018	Jul. 14, 2018	Apr. 20, 2019	Apr. 21, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Earnings Per Share [Abstract]
Net income	$ 2,219	$ 43,358	$ 53,095	$ 20,841	$ 39,630	$ 45,442	$ 65,866	$ 51,247	$ 164,538	$ 157,160	$ 150,120
Basic Earnings Per Common Share:
Basic weighted average shares outstanding per common share									211,606	211,016	209,573
Basic earnings per common share	$ 0.01	$ 0.20	$ 0.25	$ 0.10	$ 0.19	$ 0.22	$ 0.31	$ 0.24	$ 0.78	$ 0.74	$ 0.72
Diluted Earnings Per Common Share:
Basic weighted average shares outstanding per common share									211,606	211,016	209,573
Add: Shares of common stock assumed issued upon exercise of stock options, vesting of performance-contingent restricted stock and deferred stock									368	616	862
Diluted weighted average shares outstanding per common share									211,974	211,632	210,435
Diluted earnings per common share	$ 0.01	$ 0.20	$ 0.25	$ 0.10	$ 0.19	$ 0.21	$ 0.31	$ 0.24	$ 0.78	$ 0.74	$ 0.71