Consolidated Condensed Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Apr. 28, 2013	Apr. 29, 2012
Net sales	$ 162,407	$ 116,642
Cost of sales	65,120	61,305
Gross profit	97,287	55,337
Operating costs and expenses:
Selling, general and administrative	34,794	44,818
Product development and engineering	34,559	24,083
Intangible amortization and impairments	7,856	5,578
Total operating costs and expenses	77,209	74,479
Operating income (loss)	20,078	(19,142)
Interest expense	(4,060)	(1,843)
Interest income and other (expense) income, net	(807)	214
Income (loss) before taxes	15,211	(20,771)
Provision (benefit) for taxes	434	(22,980)
Net income	$ 14,777	$ 2,209
Earnings per share:
Basic (in dollars per share)	$ 0.22	$ 0.03
Diluted (in dollars per share)	$ 0.22	$ 0.03
Weighted average number of shares used in computing earnings per share:
Basic (in shares)	66,956	65,282
Diluted (in shares)	68,579	67,233