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Business and Basis of Presentation (Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Numerator      
Net income (loss) $ 164,682 $ 142,281 $ (35,800)
Denominator      
Denominator for basic earnings (loss) per share - weighted average shares outstanding 50,210 50,723 52,068
Dilutive effect of unvested restricted stock units and options issued to employees and directors (in shares) 395 417 0
Denominator for diluted earnings (loss) per share (in shares) 50,605 51,140 52,068
Earnings (loss) per Common Share:      
Basic net (loss) earnings per share (in USD per share) $ 3.28 $ 2.81 $ (0.69)
Diluted net (loss) earnings per share (in USD per share) $ 3.25 $ 2.78 $ (0.69)
Antidilutive securities excluded from computation of earnings per share (in shares) 500 300 1,400