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Net Income (Loss) Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Net Income (Loss) Per Share        
Net income (loss) $ 48,503 $ (195,331) $ 63,944 $ (191,928)
Shares used in net income (loss) per share computation:        
Weighted average shares outstanding - basic 160,871 157,706 160,051 158,383
Effect of potentially dilutive equivalent shares 2,517   1,458  
Weighted average shares outstanding - diluted 163,388 157,706 161,509 158,383
Net income (loss) per share:        
Basic (in dollars per share) $ 0.30 $ (1.24) $ 0.40 $ (1.21)
Diluted (in dollars per share) $ 0.30 $ (1.24) $ 0.40 $ (1.21)
Anti-dilutive equivalents shares excluded 11,080 15,951 15,874 17,505