Income Taxes - Components of Income Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Income Tax Disclosure [Abstract]
Federal	$ 8,063	$ 4,602	$ 8,861
State	1,066	921	443
Total current	9,129	5,523	9,304
Federal	(10,010)	5,371	4,893
State	944	906	1,100
Total deferred	(9,066)	6,277	5,993
Income tax expense	$ 63	$ 11,800	$ 15,297