Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 25, 2015	Jan. 26, 2014
Net sales	$ 490,219	$ 557,885	$ 594,977
Cost of sales	197,109	229,093	244,719
Cost of sales - lower of cost or market write-down	0	0	15,047
Gross profit	293,110	328,792	335,211
Operating costs and expenses:
Selling, general and administrative	136,151	127,134	126,033
Product development and engineering	113,737	119,371	137,437
Intangible amortization	25,059	25,718	29,002
Intangible asset impairments	0	11,636	32,538
Goodwill impairment	0	0	116,686
Changes in the fair value of contingent earn-out obligations	(16,362)	1,391	(654)
Restructuring charges	4,526	1,285	3,086
Total operating costs and expenses	263,111	286,535	444,128
Operating income (loss)	29,999	42,257	(108,917)
Interest expense	(7,819)	(5,927)	(18,174)
Interest income and other (expense) income, net	(1,801)	165	(1,390)
Income (loss) before taxes	20,379	36,495	(128,481)
Provision (benefit) for taxes	8,882	8,548	35,985
Net income (loss)	$ 11,497	$ 27,947	$ (164,466)
Earnings per share:
Basic (in dollars per share)	$ 0.18	$ 0.42	$ (2.44)
Diluted (in dollars per share)	$ 0.17	$ 0.41	$ (2.44)
Weighted average number of shares used in computing earnings per share:
Basic (in shares)	65,657	67,108	67,471
Diluted (in shares)	65,961	67,685	67,471