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Stockholders' Equity (Narrative) (Details)
 12 Months Ended
Mar. 31, 2018
USD ($)
vote / shares
$ / shares
shares
Mar. 31, 2017
$ / shares
shares
Class of Stock [Line Items]    
Common stock, shares authorized (in shares) | shares 250,000,000 250,000,000
Common stock, par value (in USD per share) | $ / shares $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) | shares 5,000,000 5,000,000
Preferred stock, par value (in USD per share) | $ / shares $ 0.01 $ 0.01
Voting rights, number of votes per common share owned | vote / shares 1  
Dividends declared on common stock | $ $ 0  
Restricted Shares    
Class of Stock [Line Items]    
Restricted stock repurchased during period (in shares) | shares 20,549 25,768
Restricted stock acquired, average cost per share (in USD per share) | $ / shares $ 52.33 $ 55.51