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Stockholders' Equity (Narratives) (Details) - $ / shares | 12 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2014
Dividends declared one [Member] |  |  |
Dividends Declared |  |  |
Dividends payable, date declared | Mar. 15, 2016 |  |
Dividend paid, amount per share | $ 1.00 |  |
Dividends payable, date of record | Apr. 05, 2016 |  |
Dividends payable, date to be paid | Apr. 21, 2016 |  |
Dividends declared two [Member] |  |  |
Dividends Declared |  |  |
Dividends payable, date declared | Aug. 28, 2015 |  |
Dividend paid, amount per share | $ 3.00 |  |
Dividends payable, date of record | Sep. 16, 2015 |  |
Dividends payable, date to be paid | Oct. 02, 2015 |  |
Dividends declared three [Member] |  |  |
Dividends Declared |  |  |
Dividends payable, date declared | Jun. 04, 2015 |  |
Dividend paid, amount per share | $ 1.00 |  |
Dividends payable, date of record | Jun. 19, 2015 |  |
Dividends payable, date to be paid | Jul. 01, 2015 |  |
Dividends declared four [Member] |  |  |
Dividends Declared |  |  |
Dividends payable, date declared |  | Feb. 04, 2015 |
Dividend paid, amount per share |  | $ 1.00 |
Dividends payable, date of record |  | Mar. 06, 2015 |
Dividends payable, date to be paid |  | Mar. 17, 2015 |
Dividends declared five [Member] |  |  |
Dividends Declared |  |  |
Dividends payable, date declared |  |  | Dec. 04, 2013
Dividend paid, amount per share |  |  | $ 1.00
Dividends payable, date of record |  |  | Jan. 10, 2014
Dividends payable, date to be paid |  |  | Feb. 14, 2014

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