Pro Forma Consolidated Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						4 Months Ended		12 Months Ended
	Jan. 02, 2016	Oct. 10, 2015	Jul. 18, 2015	Jan. 03, 2015	Oct. 04, 2014	Jul. 12, 2014	Apr. 25, 2015	Apr. 19, 2014	Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013
Acquisition [Abstract]
Sales, As reported	$ 858,363	$ 885,302	$ 888,795	$ 877,333	$ 844,932	$ 872,791	$ 1,146,045	$ 1,153,917	$ 3,778,505	$ 3,748,973	$ 3,732,616
Sales, Pro forma											3,732,616
Net income, As reported	$ 32,246	$ 43,796	$ 51,760	$ 28,010	$ 44,599	$ 42,064	$ 61,389	$ 61,066	$ 189,191	$ 175,739	230,894
Net income, Pro forma											$ 227,076
Basic net income per common share, As reported	$ 0.15	$ 0.21	$ 0.25	$ 0.13	$ 0.21	$ 0.20	$ 0.29	$ 0.29			$ 1.11
Basic net income per common share, Pro forma											1.09
Diluted net income per common share, As reported	$ 0.15	$ 0.21	$ 0.24	$ 0.13	$ 0.21	$ 0.20	$ 0.29	$ 0.29			1.09
Diluted net income per common share, Pro forma											$ 1.07