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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

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