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Earnings Per Share (Computation of Basis and Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Numerator        
Net income $ 314,793 $ 31,641 $ 379,257 $ 58,305
Denominator        
Denominator for basic earnings per share — weighted average shares outstanding (in shares) 53,129 52,999 53,089 52,960
Dilutive effect of unvested restricted stock units and options issued to employees and directors (in shares) 414 360 442 379
Denominator for diluted earnings per share (in shares) 53,543 53,359 53,531 53,339
Earnings per Common Share:        
Basic net earnings per share (in USD per share) $ 5.93 $ 0.60 $ 7.14 $ 1.10
Diluted net earnings per share (in USD per share) $ 5.88 $ 0.59 $ 7.08 $ 1.09