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Stockholders' Equity (Narrative) (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 vote $ / shares shares | Sep. 30, 2016 shares | Sep. 30, 2017 USD ($) vote $ / shares shares | Sep. 30, 2016 $ / 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 |  | 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 |  |
Restricted Shares |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Restricted stock repurchased during period (in shares) | shares | 933 | 0 | 20,549 | 24,988 |
Restricted stock acquired, average cost per share (in USD per share) | $ / shares | $ 51.60 |  | $ 52.33 | $ 55.82 |

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