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Computation Of Net (Loss) Income Per Common Share (Reconciliation Of Numerators And Denominators Of EPS Calculation) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Computation Of Net (Loss) Income Per Common Share [Abstract]        
Net loss $ (20,135) $ (26,271) $ (46,360) $ (115,660)
Weighted-average shares of common stock outstanding 53,745 51,459 52,558 51,120
Weighted-average shares subject to repurchase (953) (526) (592) (331)
Shares used in per-share calculation basic 52,792 50,933 51,966 50,789
Shares used in per-share calculation diluted 52,792 50,933 51,966 50,789
Net loss per share basic $ (0.38) $ (0.52) $ (0.89) $ (2.28)
Net loss per share diluted $ (0.38) $ (0.52) $ (0.89) $ (2.28)