Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 29, 2017	Jan. 31, 2016	Jan. 25, 2015
Net sales	$ 544,272	$ 490,219	$ 557,885
Cost of sales	219,410	197,109	229,093
Gross profit	324,862	293,110	328,792
Operating costs and expenses:
Selling, general and administrative	136,426	136,151	127,134
Product development and engineering	102,500	113,737	119,371
Intangible amortization	25,301	25,059	25,718
Gain on disposition of business operations	(25,513)	0	0
Intangible asset impairments	0	0	11,636
Changes in the fair value of contingent earn-out obligations	(215)	(16,362)	1,391
Restructuring charges	2,282	4,526	1,285
Total operating costs and expenses	240,781	263,111	286,535
Operating income	84,081	29,999	42,257
Interest expense, net	(9,300)	(7,819)	(5,927)
Non-operating (expense) income, net	(1,721)	(1,801)	165
Income before taxes	73,060	20,379	36,495
Provision for taxes	18,399	8,882	8,548
Net income	$ 54,661	$ 11,497	$ 27,947
Earnings per share:
Basic (in dollars per share)	$ 0.84	$ 0.18	$ 0.42
Diluted (in dollars per share)	$ 0.83	$ 0.17	$ 0.41
Weighted average number of shares used in computing earnings per share:
Basic (in shares)	65,427	65,657	67,108
Diluted (in shares)	66,109	65,961	67,685