Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 03, 2020	Dec. 28, 2018	Dec. 29, 2017
Cash paid during the year:
Income taxes	$ 21,364	$ 28,636	$ 25,849
Non-cash investing and financing activities:
Unrealized (loss) gain on investments	347	191	(90)
Vested stock unit awards granted to settle accrued bonus	7,947	7,643	6,910
Accrual for capital expenditures	482	$ 1,231	$ 148
Right-of-use asset obtained in exchange for operating lease obligation	$ 29,480