Condensed Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 30, 2017	Jul. 31, 2016	Jul. 30, 2017	Jul. 31, 2016
Net sales	$ 153,127	$ 135,911	$ 296,929	$ 267,056
Cost of sales	60,891	54,136	119,778	106,757
Gross profit	92,236	81,775	177,151	160,299
Operating costs and expenses:
Selling, general and administrative	39,237	32,824	72,823	66,538
Product development and engineering	27,432	26,325	53,415	51,497
Intangible amortization	6,675	6,328	12,961	12,731
Loss on disposition of business operations	0	0	375	0
Changes in the fair value of contingent earn-out obligations	0	(129)	0	(162)
Restructuring charges	0	0	429	0
Total operating costs and expenses	73,344	65,348	140,003	130,604
Operating income	18,892	16,427	37,148	29,695
Interest expense, net	(2,029)	(2,037)	(4,075)	(3,967)
Non-operating expense, net	(204)	(136)	(836)	(181)
Income before taxes	16,659	14,254	32,237	25,547
Provision for taxes	4,095	5,276	7,852	9,681
Net income	$ 12,564	$ 8,978	$ 24,385	$ 15,866
Earnings per share:
Basic (in dollars per share)	$ 0.19	$ 0.14	$ 0.37	$ 0.24
Diluted (in dollars per share)	$ 0.19	$ 0.14	$ 0.36	$ 0.24
Weighted average number of shares used in computing earnings per share:
Basic (in shares)	65,763	65,299	65,801	65,222
Diluted (in shares)	67,470	65,905	67,421	65,723