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Condensed Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Cash flows from operating activities:    
Net loss $ (26,224) $ (89,388)
Adjustments to reconcile net (loss) to net cash (used in) operations:    
Depreciation and amortization 6,628 6,670
Stock-based compensation expense 4,039 5,579
Write-off of advanced payment to The Switch   20,551
Restructuring charges, net of payments (49) 2,174
Impairment of long-lived and intangible assets   918
Provision for excess and obsolete inventory 421 1,503
Adverse purchase commitment losses (recoveries), net (8,309) 167
Loss on minority interest investments 1,490 1,351
Change in fair value of derivatives and warrants 897  
Non-cash interest expense 4,443  
Other non-cash items 350 441
Changes in operating asset and liability accounts:    
Accounts receivable 2,856 (3,709)
Inventory (971) (6,800)
Prepaid expenses and other current assets 8,394 (12,529)
Accounts payable and accrued expenses (14,900) (37,633)
Deferred revenue (2,236) 3,809
Net cash (used in) operating activities (23,171) (106,896)
Cash flows from investing activities:    
Purchase of property, plant and equipment (903) (7,303)
Proceeds from the maturity of marketable securities 84 111,070
Change in restricted cash (4,116) (3,781)
Purchase of intangible assets   (768)
Purchase of minority investments   (1,800)
Advanced payment for planned acquisition   (20,551)
Change in other assets   (639)
Net cash (used in) provided by investing activities (4,935) 76,228
Cash flows from financing activities:    
Employee taxes paid related to net settlement of equity awards (36) (271)
Repayment of debt   (4,641)
Proceeds from the issuance of debt, net of expenses 31,101 4,641
Proceeds from exercise of employee stock options and ESPP 178 150
Net cash provided by (used in) financing activities 31,243 (121)
Effect of exchange rate changes on cash and cash equivalents (280) 517
Net increase (decrease) in cash and cash equivalents 2,857 (30,272)
Cash and cash equivalents at beginning of period 46,279 123,783
Cash and cash equivalents at end of period 49,136 93,511
Supplemental schedule of cash flow information:    
Cash paid for income taxes, net of refunds (752) 18,147
Issuance of common stock to settle liabilities 2,676 421
Cash paid for interest expense $ 269