Supplemental Disclosure of Cash Flow Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 01, 2016	Jan. 02, 2015	Jan. 03, 2014
Cash paid during period:
Income taxes	$ 24,651	$ 27,421	$ 24,701
Non-cash investing and financing activities:
Unrealized gain (loss) on investments	(79)	4	(14)
Vested stock unit awards granted to settle accrued bonus	6,169	6,008	5,807
Accrual for capital expenditures	$ 321	$ 0	$ 0