Supplemental Disclosure of Cash Flow Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 01, 2021	Jan. 03, 2020	Dec. 28, 2018
Cash paid during the year:
Income taxes	$ 20,118	$ 21,364	$ 28,636
Non-cash investing and financing activities:
Unrealized gain (loss) on investments	(237)	347	191
Vested stock unit awards granted to settle accrued bonus	8,645	7,947	7,643
Accrual for capital expenditures	602	482	$ 1,231
Right-of-use asset obtained in exchange for operating lease obligation	$ 2,436	$ 29,480