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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, 2018
Mar. 31, 2017
Mar. 31, 2016
Net Income (loss):      
Continuing operations $ 208,542 $ 205,876 $ 128,362
Discontinued operations 0 0 (9,045)
Net income $ 208,542 $ 205,876 $ 119,317
Shares used in net income (loss) per share computation:      
Weighted average shares outstanding - basic (in shares) 164,038 162,058 163,296
Effect of potentially dilutive equivalent shares (in shares) 4,933 3,482 2,496
Weighted average shares outstanding - diluted (in shares) 168,971 165,540 165,792
Net income (loss) per share - basic:      
Continuing operations (in dollars per share) $ 1.27 $ 1.27 $ 0.79
Discontinued operations (in dollars per share) 0.00 0.00 (0.06)
Net income per share - basic (in dollars per share) 1.27 1.27 0.73
Net income (loss) per share - diluted:      
Continuing operations (in dollars per share) 1.23 1.24 0.77
Discontinued operations (in dollars per share) 0.00 0.00 (0.05)
Net income per share - diluted (in dollars per share) $ 1.23 $ 1.24 $ 0.72
Anti-dilutive equivalents shares excluded (in shares) 1,100 1,400 5,200