Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Operating activities:
Net loss	$ (116,509)	$ (15,106)
Adjustments to reconcile net loss to net cash used for operating activities:
Depreciation	7,247	6,000
Amortization of purchased intangibles	3,626	5,425
Stock-based compensation expense:
Stock options	3,024	4,207
Restricted stock units	18,521	7,528
Warrants	1,289	0
Veloce accrued liability	56,580	0
Acquisition related adjustment	(133)	(2,267)
Net (gain) loss on disposals of property, equipment and other assets	(1,296)	10
Tax effect on other comprehensive income	(130)	0
Restructuring charges - asset impairment	4,689	0
Changes in operating assets and liabilities:
Accounts receivable	5,304	(10,831)
Inventories	9,387	8,992
Other assets	(2,758)	(3,825)
Accounts payable	(3,907)	(5,124)
Accrued payroll and other accrued liabilities	887	2,506
Veloce accrued liability	(15,928)	0
Deferred revenue	(841)	(465)
Net cash used for operating activities	(30,948)	(2,950)
Investing activities:
Proceeds from sales and maturities of short-term investments	35,367	95,308
Purchases of short-term investments	(17,834)	(79,891)
Proceeds from sale of property, equipment and other assets	1,800	0
Purchase of property, equipment and other assets	(8,454)	(11,899)
Proceeds from sale of strategic equity investment	7,146	0
Purchases of strategic equity investment	(500)	(4,750)
Funding of a note receivable	(500)	0
Net cash provided by (used for) investing activities	17,025	(1,232)
Financing activities:
Proceeds from issuance of common stock	5,841	3,874
Funding of restricted stock units withheld for taxes	(2,773)	(2,739)
Repurchase of common stock	(653)	(20,852)
Funding of structured stock repurchase agreements	0	(10,000)
Payment of contingent consideration	(485)	0
Other	(389)	(272)
Net cash provided by (used for) financing activities	1,541	(29,989)
Net decrease in cash and cash equivalents	(12,382)	(34,171)
Cash and cash equivalents at beginning of year	28,065	84,402
Cash and cash equivalents at end of period	15,683	50,231
Supplementary cash flow disclosures:
Income taxes	662	627
Shares issued for Veloce merger consideration	$ 15,956	$ 0