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Stockholders' Equity (Narrative) (Details)
 3 Months Ended 6 Months Ended
Sep. 30, 2018
vote
$ / shares
shares
Sep. 30, 2017
$ / shares
shares
Sep. 30, 2018
USD ($)
vote
$ / shares
shares
Sep. 30, 2017
$ / shares
shares
Mar. 31, 2018
$ / shares
shares
Class of Stock [Line Items]          
Common stock, shares authorized (in shares) | shares 250,000,000   250,000,000   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   5,000,000   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     1,449,750    
Stock acquired, average cost per share (in USD per share) | $ / shares     $ 34.47    
Treasury stock acquired | $     $ 50,000,000    
Restricted Shares          
Class of Stock [Line Items]          
Stock repurchased during period (in shares) | shares 0 933 68,939 20,549  
Stock acquired, average cost per share (in USD per share) | $ / shares   $ 51.60 $ 33.09 $ 52.33