Supplemental Disclosure of Cash Flow Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2017	Dec. 30, 2016	Jan. 01, 2016
Cash paid during period:
Income taxes	$ 25,849	$ 22,280	$ 24,651
Non-cash investing and financing activities:
Unrealized loss on investments	(90)	(81)	(79)
Vested stock unit awards granted to settle accrued bonus	6,910	6,334	6,169
Accrual for capital expenditures	$ 148	$ 284	$ 321