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Condensed Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Cash flows from operating activities:    
Net loss $ (115,660) $ (1,150)
Adjustments to reconcile net loss to net cash used in operations:    
Depreciation and amortization 10,875 7,990
Stock-based compensation expense 7,697 10,311
Provision for excess and obsolete inventory 2,150 2,667
Adverse purchase commitment losses (recoveries), net 73  
Allowance for doubtful accounts   25
Write-off of advance payment 20,551  
Write-off of prepaid value added taxes   550
Restructuring charges, net of payments 2,721  
Impairment of long-lived assets 2,829  
Deferred income taxes   (3,902)
Other non-cash items 2,227 2,025
Changes in operating asset and liability accounts:    
Accounts receivable (1,262) 40,431
Inventory (10,419) (42,934)
Prepaid expenses and other current assets 3,244 (16,973)
Accounts payable and accrued expenses (63,554) 4,945
Deferred revenue 5,254 (20,027)
Net cash used in operating activities (133,274) (16,042)
Cash flows from investing activities:    
Purchase of property, plant and equipment (9,332) (30,690)
Purchase of marketable securities   (71,763)
Proceeds from sales and maturities of marketable securities 110,667 47,462
Change in restricted cash (6,036) 250
Purchase of intangible assets (3,893) (2,001)
Purchase of minority investments (1,800) (8,000)
Advance payment for previously planned acquisition (20,551)  
Change in other assets (734) (30)
Net cash provided by (used in) investing activities 68,321 (64,772)
Cash flows from financing activities:    
Payments in lieu of issuance of common stock for payroll taxes (271)  
Proceeds from public equity offering, net   155,240
Proceeds from exercise of employee stock options and ESPP 150 7,350
Net cash (used in) provided by financing activities (121) 162,590
Effect of exchange rate changes on cash and cash equivalents (104) (351)
Net (decrease) increase in cash and cash equivalents (65,178) 81,427
Cash and cash equivalents at beginning of period 123,783 87,594
Cash and cash equivalents at end of period 58,605 169,021
Supplemental schedule of cash flow information:    
Cash paid for income taxes, net of refunds 13,482 13,660
Non-cash contingent consideration in connection with acquisitions   10,003
Non-cash issuance of common stock $ 586 $ 637