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Earnings Per Share (Tables) | 9 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings Per Share | The following table sets forth the computation of basic and diluted earnings per share:
|  | Three Months Ended December 31, |  | Nine Months Ended December 31,
(In thousands, except per share data) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Numerator |  |  |  |  |  |  |  |
Net income |  | $ | 314,793 |  |  | $ | 31,641 |  |  | $ | 379,257 |  |  | $ | 58,305 |
Denominator |  |  |  |  |  |  |  |  |  |
Denominator for basic earnings per share — weighted average shares outstanding |  | 53,129 |  |  | 52,999 |  |  | 53,089 |  |  | 52,960 |
Dilutive effect of unvested restricted stock units and options issued to employees and directors |  | 414 |  |  | 360 |  |  | 442 |  |  | 379 |
Denominator for diluted earnings per share |  | 53,543 |  |  | 53,359 |  |  | 53,531 |  |  | 53,339 |
Earnings per Common Share: |  |  |  |  |  |  |  |  |  |
Basic net earnings per share |  | $ | 5.93 |  |  | $ | 0.60 |  |  | $ | 7.14 |  |  | $ | 1.10 |
Diluted net earnings per share |  | $ | 5.88 |  |  | $ | 0.59 |  |  | $ | 7.08 |  |  | $ | 1.09 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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