Condensed Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 29, 2017	Oct. 30, 2016	Oct. 29, 2017	Oct. 30, 2016
Net sales	$ 150,304	$ 137,185	$ 447,233	$ 404,241
Cost of sales	60,885	56,120	180,663	162,877
Gross profit	89,419	81,065	266,570	241,364
Operating costs and expenses:
Selling, general and administrative	36,568	35,116	109,820	101,654
Product development and engineering	27,631	25,600	81,046	77,097
Intangible amortization	7,453	6,286	20,414	19,017
(Gain) loss on disposition of business operations	0	(25,036)	375	(25,036)
Changes in the fair value of contingent earn-out obligations	188	0	188	(162)
Total operating costs and expenses	71,840	41,966	211,843	172,570
Operating income	17,579	39,099	54,727	68,794
Interest expense, net	(2,032)	(1,890)	(6,107)	(5,857)
Non-operating income (expense), net	1,267	(690)	431	(871)
Income before taxes and equity in net losses of equity method investments	16,814	36,519	49,051	62,066
Provision for taxes	3,272	5,743	11,124	15,424
Net income before equity in net losses of equity method investments	13,542	30,776	37,927	46,642
Equity in net losses of equity method investments	(204)	0	(204)	0
Net income	$ 13,338	$ 30,776	$ 37,723	$ 46,642
Earnings per share:
Basic (in dollars per share)	$ 0.20	$ 0.47	$ 0.57	$ 0.71
Diluted (in dollars per share)	$ 0.20	$ 0.46	$ 0.56	$ 0.71
Weighted average number of shares used in computing earnings per share:
Basic (in shares)	66,194	65,549	65,932	65,331
Diluted (in shares)	67,817	66,206	67,555	65,899