Condensed Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 25, 2015	Oct. 26, 2014	Oct. 25, 2015	Oct. 26, 2014
Net sales	$ 115,810	$ 148,890	$ 371,610	$ 427,491
Cost of sales	46,226	59,564	148,050	171,860
Gross profit	69,584	89,326	223,560	255,631
Operating costs and expenses:
Selling, general and administrative	30,747	31,920	102,383	95,163
Product development and engineering	26,855	28,401	84,771	84,387
Intangible amortization	6,308	6,423	18,648	19,292
Changes in the fair value of contingent earn-out obligations	(14,186)	(228)	(13,618)	(228)
Restructuring charge	962	0	4,526	1,001
Total operating costs and expenses	50,686	66,516	196,710	199,615
Operating income	18,898	22,810	26,850	56,016
Interest expense, net	(1,964)	(1,462)	(5,698)	(4,437)
Non-operating (expense) income, net	(777)	216	(1,152)	(407)
Income before taxes	16,157	21,564	20,000	51,172
Provision for taxes	5,453	3,941	9,750	7,784
Net income	$ 10,704	$ 17,623	$ 10,250	$ 43,388
Earnings per share:
Basic (in dollars per share)	$ 0.16	$ 0.26	$ 0.16	$ 0.65
Diluted (in dollars per share)	$ 0.16	$ 0.26	$ 0.15	$ 0.64
Weighted average number of shares used in computing earnings per share:
Basic (in shares)	65,117	67,162	65,920	67,223
Diluted (in shares)	65,217	67,654	66,251	67,791