Company's Effective Tax Rate Differs From Statutory Federal Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 01, 2021	Jan. 03, 2020	Dec. 28, 2018
Income Tax Disclosure [Abstract]
Tax at federal statutory rate	$ 20,357	$ 21,880	$ 19,597
State taxes, net of federal benefit	2,942	4,129	4,391
Divestiture of foreign subsidiary	46	956	0
Nondeductible officer compensation	907	759	0
Non-deductible expenses	118	345	335
Non-deductible stock-based compensation	(14)	2	20
Excess tax benefit from equity incentive plans	(9,725)	(6,394)	(3,310)
Difference between statutory rate and foreign effective tax rate	(486)	(341)	(217)
Other	239	394	247
Total	$ 14,384	$ 21,730	$ 21,063
Effective tax rate	14.80%	20.90%	22.60%