Income Taxes - Components of Income Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Income Tax Disclosure [Abstract]
Federal	$ 9,906	$ 5,747	$ 11,818
State	2,571	2,282	4,416
Total current	12,477	8,029	16,234
Federal	528	3,179	(3,407)
State	(1,121)	1,231	(1,555)
Total deferred	(593)	4,410	(4,962)
Income tax expense	$ 11,884	$ 12,439	$ 11,272