Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 28, 2018	Jan. 29, 2017	Jan. 31, 2016
Net sales	$ 587,847	$ 544,272	$ 490,219
Cost of sales	235,876	219,410	197,109
Gross profit	351,971	324,862	293,110
Operating costs and expenses:
Selling, general and administrative	146,303	138,708	140,677
Product development and engineering	104,798	102,500	113,737
Intangible amortization	27,867	25,301	25,059
Loss (gain) on disposition of business operations	375	(25,513)	0
Changes in the fair value of contingent earn-out obligations	3,892	(215)	(16,362)
Total operating costs and expenses	283,235	240,781	263,111
Operating income	68,736	84,081	29,999
Interest expense, net	(7,963)	(9,300)	(7,819)
Non-operating expense, net	(902)	(1,721)	(1,801)
Income before taxes and equity in net losses of equity method investments	59,871	73,060	20,379
Provision for taxes	23,191	18,399	8,882
Net income before equity in net losses of equity method investments	36,680	54,661	11,497
Equity in net losses of equity method investments	(254)	0	0
Net income	$ 36,426	$ 54,661	$ 11,497
Earnings per share:
Basic (in dollars per share)	$ 0.55	$ 0.84	$ 0.18
Diluted (in dollars per share)	$ 0.54	$ 0.83	$ 0.17
Weighted average number of shares used in computing earnings per share:
Basic (in shares)	66,027	65,427	65,657
Diluted (in shares)	67,605	66,109	65,961