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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2010
Cash flows from operating activities:      
Net (loss) income $ (136,827) $ (186,284) $ 16,248
Adjustments to reconcile net income to net cash (used in) provided by operations:      
Depreciation and amortization 15,455 11,300 9,789
Stock-based compensation expense 9,864 13,443 13,632
Write-off of advanced payment to The Switch 20,551    
Patent costs 4,917    
Restructuring charges, net of payments 2,798    
Impairment of goodwill   48,959  
Impairment of long-lived and intangible assets 1,715 996  
Provision for excess and obsolete inventory 4,357 63,882  
Adverse purchase commitment losses (recoveries), net (1,299) 38,763  
Provision for doubtful accounts receivable   25 (523)
Write-off of prepaid taxes   5,905  
Loss on minority interest investments 2,407 1,396 156
Deferred income taxes   3,660 (2,717)
Other non-cash items 771 949 999
Changes in operating asset and liability accounts:      
Accounts receivable (4,820) 63,175 (16,993)
Inventory (7,528) (51,942) (656)
Prepaid expenses and other current assets 1,685 (15,428) (10,051)
Accounts payable and accrued expenses (64,148) (222) 23,775
Deferred revenue 9,060 (21,398) 7,021
Net cash provided by (used in) operating activities (141,042) (22,821) 40,680
Cash flows from investing activities:      
Purchase of property, plant and equipment (10,895) (40,862) (16,541)
Purchase of marketable securities   (157,905) (81,980)
Proceeds from the maturity of marketable securities 110,117 104,830 59,387
Change in restricted cash (9,093) 247 1,602
Purchase of intangible assets (4,227) (2,514) (1,516)
Purchase of minority investments (1,800) (9,765) (848)
Advanced payment for planned acquisition (20,551)    
Change in other assets (214) 1,136 (100)
Net cash (used in) provided by investing activities 63,337 (104,833) (39,996)
Cash flows from financing activities:      
Employee taxes paid related to net settlement of equity awards (271)    
Proceeds from debt 4,682    
Repayment of debt (4,682)    
Proceeds from public equity offering, net   155,240  
Proceeds from exercise of employee stock options and ESPP 328 7,818 19,003
Net cash provided by financing activities 57 163,058 19,003
Effect of exchange rate changes on cash and cash equivalents 144 785 (2,767)
Net (decrease) increase in cash and cash equivalents (77,504) 36,189 16,920
Cash and cash equivalents at beginning of year 123,783 87,594 70,674
Cash and cash equivalents at end of year 46,279 123,783 87,594
Supplemental schedule of cash flow information:      
Cash paid for income taxes, net of refunds 13,357 16,434 12,387
Non-cash contingent consideration in connection with acquisitions   10,004 10,828
Non-cash issuance of common stock $ 720 $ 842 $ 1,915