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Computation Of Net (Loss) Income Per Common Share (Schedule Of Earnings Per Share Calculation) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Computation Of Net (Loss) Income Per Common Share [Abstract]        
Net loss $ (26,271) $ (18,158) $ (115,660) $ (1,150)
Weighted-average shares of common stock outstanding 51,459,000 48,731,000 51,120,000 46,667,000
Weighted-average shares subject to repurchase (526,000) (663,000) (331,000) (650,000)
Shares used in per-share calculation basic 50,933,000 48,068,000 50,789,000 46,017,000
Shares used in per-share calculation diluted 50,933,000 48,068,000 50,789,000 46,017,000
Net loss per share basic $ (0.52) $ (0.38) $ (2.28) $ (0.02)
Net loss per share diluted $ (0.52) $ (0.38) $ (2.28) $ (0.02)
Anti-dilutive shares excluded from calculation of diluted EPS 2,400,000 2,400,000 2,000,000 2,000,000