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Summary Of Significant Accounting Policies (Tables)
 12 Months Ended
Mar. 31, 2012
Summary Of Significant Accounting Policies [Abstract]  
Estimated Useful Life Of Property, Plant And Equipment
Asset classification Estimated useful life in years
Building 40
Process upgrades to the building 10-40
Machinery and equipment 3-10
Furniture and fixtures 3-5
Leasehold improvements Shorter of the estimated useful life or the remaining lease term
Reconciliation Of Numerators And Denominators Of EPS Calculation
    Year ended March 31,    
    2012     2011     2010  
 
Numerator:                  
Net (loss) income $ (136,827 ) $ (186,284 ) $ 16,248  
Denominator:                  
Weighted-average shares of common stock outstanding   51,144     47,750     44,493  
Weighted-average shares subject to repurchase   (302 )   (647 )   (48 )
Shares used in per-share calculation basic   50,842     47,103     44,445  
Dilutive effect of employee equity incentive plans   -     -     845  
Shares used in per-share calculation diluted   50,842     47,103     45,290  
Net (loss) income per share basic $ (2.69 ) $ (3.95 ) $ 0.37  
Net (loss) income per share diluted $ (2.69 ) $ (3.95 ) $ 0.36