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Condensed Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operating activities:    
Net loss $ (46,360) $ (115,660)
Adjustments to reconcile net (loss) to net cash (used in) operations:    
Depreciation and amortization 10,143 10,875
Stock-based compensation expense 5,968 7,697
Write-off of advanced payment to The Switch   20,551
Restructuring charges, net of payments 261 2,721
Impairment of long-lived and intangible assets 4,507 2,829
Provision for excess and obsolete inventory 957 2,150
Adverse purchase commitment losses (recoveries), net (8,428) 73
Loss on minority interest investments 1,914 1,614
Change in fair value of derivatives and warrants (6,114)  
Non-cash interest expense 8,404  
Other non-cash items 1,790 613
Changes in operating asset and liability accounts:    
Accounts receivable 6,085 (1,262)
Inventory (8,173) (10,419)
Prepaid expenses and other current assets 4,699 3,244
Accounts payable and accrued expenses (20,330) (63,554)
Deferred revenue 3,986 5,254
Net cash used in operating activities (40,691) (133,274)
Cash flows from investing activities:    
Purchase of property, plant and equipment (1,259) (9,332)
Proceeds from the maturity of marketable securities 5,297 110,667
Change in restricted cash 653 (6,036)
Purchase of intangible assets   (3,893)
Purchase of minority investments   (1,800)
Advanced payment for planned acquisition   (20,551)
Change in other assets   (734)
Net cash provided by investing activities 4,691 68,321
Cash flows from financing activities:    
Employee taxes paid related to net settlement of equity awards (42) (271)
Repayment of debt (769)  
Proceeds from the issuance of debt, net of expenses 32,895  
Proceeds from exercise of employee stock options and ESPP 178 150
Net cash provided by (used in) financing activities 32,262 (121)
Effect of exchange rate changes on cash and cash equivalents (84) (104)
Net decrease in cash and cash equivalents (3,822) (65,178)
Cash and cash equivalents at beginning of period 46,279 123,783
Cash and cash equivalents at end of period 42,457 58,605
Supplemental schedule of cash flow information:    
Cash paid for income taxes, net of refunds (704) 13,482
Issuance of common stock to settle liabilities 10,406 586
Cash paid for interest expense $ 543