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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Cash flows from operating activities:      
Net (loss) income $ (66,131) $ (136,827) $ (186,284)
Adjustments to reconcile net (loss) income to net cash (used in) provided by operations:      
Depreciation and amortization 13,054 15,455 11,300
Stock-based compensation expense 8,138 9,864 13,443
Write-off of advanced payment to The Switch   20,551  
Patent costs   4,917  
Restructuring charges, net of payments 902 2,798  
Impairment of goodwill     48,959
Impairment of long-lived and intangible assets 4,984 1,715 996
Provision for excess and obsolete inventory 2,230 4,357 63,882
Adverse purchase commitment losses (recoveries), net (7,768) (1,299) 38,763
Provision for doubtful accounts receivable     25
Write-off of prepaid taxes     5,905
Loss on minority interest investments 2,231 2,407 1,396
Change in fair value of derivatives and warrants (7,556)    
Non-cash interest expense 12,426    
Deferred income taxes     3,660
Other non-cash items 2,427 771 949
Changes in operating asset and liability accounts:      
Accounts receivable (751) (4,820) 63,175
Inventory (6,457) (7,528) (51,942)
Prepaid expenses and other current assets 8,887 1,685 (15,428)
Accounts payable and accrued expenses (21,864) (64,148) (222)
Deferred revenue 9,977 9,060 (21,398)
Net cash used in operating activities (45,271) (141,042) (22,821)
Cash flows from investing activities:      
Purchase of property, plant and equipment (1,430) (10,895) (40,862)
Purchase of marketable securities     (157,905)
Proceeds from the sale of property, plant and equipment 136    
Proceeds from the maturity of marketable securities 5,276 110,117 104,830
Change in restricted cash 3,678 (9,093) 247
Purchase of intangible assets   (4,227) (2,514)
Purchase of minority investments   (1,800) (9,765)
Advanced payment for planned acquisition   (20,551)  
Change in other assets (307) (214) 1,136
Net cash provided by (used in) investing activities 7,353 63,337 (104,833)
Cash flows from financing activities:      
Employee taxes paid related to net settlement of equity awards (42) (271)  
Proceeds from the issuance of debt, net of expenses 32,895 4,682  
Repayment of debt (1,923) (4,682)  
Proceeds from public equity offering, net     155,240
Proceeds from exercise of employee stock options and ESPP 291 328 7,818
Net cash provided by financing activities 31,221 57 163,058
Effect of exchange rate changes on cash and cash equivalents (339) 144 785
Net (decrease) increase in cash and cash equivalents (7,036) (77,504) 36,189
Cash and cash equivalents at beginning of period 46,279 123,783 87,594
Cash and cash equivalents at end of period 39,243 46,279 123,783
Supplemental schedule of cash flow information:      
Cash paid for income taxes, net of refunds (311) 13,357 16,434
Non-cash contingent consideration in connection with acquisitions     10,004
Issuance of common stock to settle liabilities 18,896 720 842
Cash paid for interest $ 787