Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Net revenues	$ 216,150	$ 195,642	$ 230,887
Cost of revenues	85,189	83,048	98,804
Gross profit	130,961	112,594	132,083
Operating expenses:
Research and development	146,579	187,419	175,656
Selling, general and administrative	38,927	51,684	45,794
Gain on sale of TPack	(19,699)	0	0
Gain on sale of building	(25,815)	0	0
Amortization of purchased intangible assets	316	1,926	3,202
Restructuring charges	1,134	6,435	875
Total operating expenses	141,442	247,464	225,527
Operating loss	(10,481)	(134,870)	(93,444)
Interest income (expense), net and other-than-temporary impairment	5,052	2,595	4,247
Other income (expense), net	354	(2,394)	7,437
Loss before income taxes	(5,075)	(134,669)	(81,760)
Income tax expense	619	(554)	928
Net loss	$ (5,694)	$ (134,115)	$ (82,688)
Basic and diluted net loss per share (in dollars per share)	$ (0.08)	$ (2.06)	$ (1.33)
Shares used in calculating basic and diluted net loss per share	72,897	65,258	62,245