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Stockholders' Equity (Details)
 3 Months Ended 6 Months Ended
Sep. 30, 2019
USD ($)
vote
$ / shares
shares
Sep. 30, 2018
shares
Sep. 30, 2019
USD ($)
vote
$ / shares
shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Mar. 31, 2019
$ / shares
shares
Class of Stock [Line Items]          
Common stock, shares authorized (in shares) | shares 250,000,000.0   250,000,000.0   250,000,000
Common stock, par value (in USD per share) | $ / shares $ 0.01   $ 0.01   $ 0.01
Preferred stock, shares authorized (in shares) | shares 5,000,000.0   5,000,000.0   5,000,000
Preferred stock, par value (in USD per share) | $ / shares $ 0.01   $ 0.01   $ 0.01
Voting rights, number of votes per common share owned | vote 1   1    
Dividends declared on common stock | $     $ 0    
Stock repurchased during period (in shares) | shares 672,719   1,622,544 1,449,750  
Stock acquired, average cost per share (in USD per share) | $ / shares $ 31.53   $ 30.80 $ 34.47  
Treasury stock acquired | $ $ 21,291,000   $ 50,856,000 $ 52,259,000  
Restricted Shares          
Class of Stock [Line Items]          
Stock repurchased during period (in shares) | shares 2,273 0 28,537 68,939  
Stock acquired, average cost per share (in USD per share) | $ / shares $ 35.32   $ 30.83 $ 33.09  
Treasury stock acquired | $ $ 21,200,000   $ 50,000,000.0 $ 50,000,000.0