Condensed Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 28, 2019	Apr. 29, 2018
Income Statement [Abstract]
Net sales	$ 131,354	$ 130,429
Cost of sales	50,079	58,960
Gross profit	81,275	71,469
Operating costs and expenses:
Selling, general and administrative	38,377	41,406
Product development and engineering	27,099	26,199
Intangible amortization	5,143	6,961
Changes in the fair value of contingent earn-out obligations	(2,161)	0
Total operating costs and expenses	68,458	74,566
Operating income (loss)	12,817	(3,097)
Interest expense, net	(2,467)	(2,190)
Non-operating income, net	1,043	190
Income (loss) before taxes and equity in net losses of equity method investments	11,393	(5,097)
(Benefit) for income taxes	(2,312)	(17,510)
Net income before equity in net losses of equity method investments	13,705	12,413
Equity in net losses of equity method investments	(411)	(31)
Net income	$ 13,294	$ 12,382
Earnings per share:
Basic (in dollars per share)	$ 0.20	$ 0.19
Diluted (in dollars per share)	$ 0.20	$ 0.18
Weighted average number of shares used in computing earnings per share:
Basic (in shares)	66,105	66,324
Diluted (in shares)	67,976	68,195