Condensed Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 29, 2018	Jul. 30, 2017	Jul. 29, 2018	Jul. 30, 2017
Net sales	$ 163,211	$ 153,127	$ 293,640	$ 296,929
Cost of sales	63,087	60,891	122,047	119,778
Gross profit	100,124	92,236	171,593	177,151
Operating costs and expenses:
Selling, general and administrative	33,529	39,237	74,935	73,252
Product development and engineering	28,079	27,432	54,278	53,415
Intangible amortization	6,480	6,675	13,441	12,961
Loss on disposition of business operations	0	0	0	375
Changes in the fair value of contingent earn-out obligations	(900)	0	(900)	0
Total operating costs and expenses	67,188	73,344	141,754	140,003
Operating income	32,936	18,892	29,839	37,148
Interest expense, net	(2,200)	(2,029)	(4,390)	(4,075)
Non-operating income (expense), net	542	(204)	732	(836)
Income before taxes and equity in net losses of equity method investments	31,278	16,659	26,181	32,237
Provision for taxes	6,082	4,095	(11,428)	7,852
Net income before equity in net losses of equity method investments	25,196	12,564	37,609	24,385
Equity in net losses of equity method investments	(27)	0	(58)	0
Net income	$ 25,169	$ 12,564	$ 37,551	$ 24,385
Earnings per share:
Basic (in dollars per share)	$ 0.38	$ 0.19	$ 0.57	$ 0.37
Diluted (in dollars per share)	$ 0.37	$ 0.19	$ 0.55	$ 0.36
Weighted average number of shares used in computing earnings per share:
Basic (in shares)	66,063	65,763	66,194	65,801
Diluted (in shares)	68,880	67,470	68,428	67,421