Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013		Mar. 31, 2012		Mar. 31, 2011
Operating activities:
Net loss	$ (134,115)		$ (82,688)		$ (1,006)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation	9,542		8,436		7,243
Amortization of purchased intangibles	4,643		6,754		17,167
Stock-based compensation expense:
Stock options	3,469		5,298		5,592
Restricted stock units	20,767		13,076		11,092
Warrants	1,289		0		0
Veloce accrued liability	66,188		60,400		0
Acquisition related adjustment	(133)		(2,532)		0
Capitalization of mask set cost	0		0		(1,177)
Net (gain) loss on disposals of property, equipment and other assets	(1,293)		10		(322)
Impairment loss (gain) on strategic investments, net	2,250		(7,147)		0
Tax effect on other comprehensive income	(989)		(123)		0
Restructuring charges - asset impairment	4,719		0		0
Impairment of short term investments and marketable securities	1,143		0		0
Write-off of notes receivable and other assets	1,800	[1]	0	[1]	0	[1]
Changes in operating assets and liabilities:
Accounts receivable	(1,909)		(2,669)		3,465
Inventories	10,344		3,317		(11,174)
Other assets	(2,871)		(3,903)		(1,561)
Accounts payable	(622)		(4,451)		1,842
Accrued payroll and other accrued liabilities	(82)		(2,860)		(1,162)
Veloce accrued liability	(16,537)		0		0
Deferred revenue	(668)		(270)		956
Net cash used for operating activities	(33,065)		(9,352)		30,955
Investing activities:
Proceeds from sales and maturities of short-term investments	42,164		101,222		121,876
Purchases of short-term investments	(21,633)		(103,046)		(124,950)
Proceeds from sale of property, equipment and other assets	1,800		0		365
Purchase of property, equipment and other assets	(9,045)		(13,264)		(9,740)
Proceeds from sale of strategic equity investment	7,146		0		4,991
Purchases of strategic equity investment	(500)		(4,750)		(330)
Payments to Acquire Businesses, Net of Cash Acquired	0		0		(31,484)
Net cash provided by (used for) investing activities	19,932		(19,838)		(39,272)
Financing activities:
Proceeds from issuance of common stock	8,873		6,736		8,045
Funding of restricted stock units withheld for taxes	(3,121)		(2,864)		(2,746)
Repurchase of common stock	(653)		(20,852)		(40,063)
Funding of structured stock repurchase agreements	0		(10,000)		(10,000)
Funds received from structured stock repurchase agreements, including gains	0		0		15,512
Payment of contingent consideration	(485)		0		0
Other	(481)		(167)		(555)
Net cash provided by (used for) financing activities	4,133		(27,147)		(29,807)
Net decrease in cash and cash equivalents	(9,000)		(56,337)		(38,124)
Cash and cash equivalents at beginning of year	28,065		84,402		122,526
Cash and cash equivalents at end of period	19,065		28,065		84,402
Supplementary cash flow disclosures:
Income taxes	987		692		327
Shares issued for Veloce merger consideration	$ 16,565		$ 0		$ 0

[1] During the fiscal year ended March 31, 2013, the Company wrote-off $1.5 million of notes receivable due from an investee and $0.3 million related to a prepaid intellectual property license from this investee. The Company also impaired the related equity investment of $2.3 million in this investee - see * above.