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Stock-Based Compensation - Nonvested Stock Unit Activity (Details) - $ / shares
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Restricted Stock Units (RSUs)      
Units      
Nonvested units at beginning of period (in shares) 368,182 322,142 125,307
Granted (in shares) 300,119 250,013 279,445
Vested (in shares) (149,531) (150,784) (48,207)
Canceled/Forfeited (in shares) (101,423) (53,189) (34,403)
Nonvested units at end of period (in shares) 417,347 368,182 322,142
Weighted Avg. Grant Date Fair Value      
Nonvested units at beginning of period (in dollars per share) $ 21.55 $ 20.59 $ 24.67
Granted (in dollars per share) 28.87 23.19 19.53
Vested (in dollars per share) 24.30 21.92 24.01
Canceled/Forfeited (in dollars per share) 21.10 22.41 22.00
Nonvested units at end of period (in dollars per share) $ 25.94 $ 21.55 $ 20.59
Performance Shares      
Units      
Nonvested units at beginning of period (in shares) 453,001 259,930 49,136
Granted (in shares) 183,069 193,071 219,266
Vested (in shares) (217,319) 0 0
Canceled/Forfeited (in shares) (67,647) 0 (8,472)
Nonvested units at end of period (in shares) 351,104 453,001 259,930
Weighted Avg. Grant Date Fair Value      
Nonvested units at beginning of period (in dollars per share) $ 25.53 $ 24.74 $ 28.57
Granted (in dollars per share) 28.91 26.58 23.95
Vested (in dollars per share) 23.89 0.00 0.00
Canceled/Forfeited (in dollars per share) 28.37 0.00 25.90
Nonvested units at end of period (in dollars per share) $ 27.76 $ 25.53 $ 24.74