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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 6 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Numerator        
Net income $ 45,325 $ 44,589 $ 103,080 $ 88,295
Denominator        
Denominator for basic earnings per share — weighted average shares outstanding (in shares) 50,232 50,330 50,186 50,297
Dilutive effect of nonvested restricted stock units and options issued to employees and directors (in shares) 559 331 545 375
Denominator for diluted earnings per share (in shares) 50,791 50,661 50,731 50,672
Earnings per Common Share:        
Basic earnings per share (in USD per share) $ 0.90 $ 0.89 $ 2.05 $ 1.76
Diluted earnings per share (in USD per share) $ 0.89 $ 0.88 $ 2.03 $ 1.74