Condensed Consolidated Statements Of Income (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 26, 2020	Apr. 28, 2019
Income Statement [Abstract]
Net sales	$ 132,702	$ 131,354
Cost of sales	51,941	50,079
Gross profit	80,761	81,275
Operating costs and expenses:
Selling, general and administrative	34,600	38,972
Product development and engineering	27,586	27,154
Intangible amortization	2,840	5,143
Changes in the fair value of contingent earn-out obligations	(33)	(2,161)
Total operating costs and expenses	64,993	69,108
Operating income	15,768	12,167
Interest expense	(1,559)	(2,467)
Non-operating income, net	423	1,043
Investment impairments and credit loss reserves	(3,630)	0
Income before taxes and equity in net losses of equity method investments	11,002	10,743
Provision (benefit) for income taxes	1,359	(2,416)
Net income before equity in net losses of equity method investments	9,643	13,159
Equity in net losses of equity method investments	(11)	(411)
Net income	9,632	12,748
Net loss attributable to noncontrolling interest	(3)	0
Net income attributable to common stockholders	$ 9,635	$ 12,748
Earnings per share:
Basic (in dollars per share)	$ 0.15	$ 0.19
Diluted (in dollars per share)	$ 0.15	$ 0.19
Weighted-average number of shares used in computing earnings per share:
Basic (in shares)	65,589	66,105
Diluted (in shares)	66,174	67,976