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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

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