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Net Income (Loss) per Share (Computation of Basic and Diluted Net Income per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Net Income (loss):      
Continuing operations $ 205,876 $ 128,362 $ 148,429
Discontinued operations 0 (9,045) (139,146)
Net income $ 205,876 $ 119,317 $ 9,283
Shares used in net income (loss) per share computation:      
Weighted average shares outstanding - basic (in shares) 162,058 163,296 163,536
Effect of potentially dilutive equivalent shares (in shares) 3,482 2,496 2,638
Weighted average shares outstanding - diluted (in shares) 165,540 165,792 166,174
Net income (loss) per share - basic:      
Continuing operations (in dollars per share) $ 1.27 $ 0.79 $ 0.91
Discontinued operations (in dollars per share) 0.00 (0.06) (0.85)
Net income per share - basic (in dollars per share) 1.27 0.73 0.06
Net income (loss) per share - diluted:      
Continuing operations (in dollars per share) 1.24 0.77 0.89
Discontinued operations (in dollars per share) 0.00 (0.05) (0.83)
Net income per share - diluted (in dollars per share) $ 1.24 $ 0.72 $ 0.06
Anti-dilutive equivalents shares excluded (in shares) 1,400 5,200 9,000