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Stockholders' Equity (Narratives) (Details) - $ / shares | 12 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Dividends Declared |  |  |
Dividends payable, date declared | Oct. 05, 2016 |  |
Dividend paid, amount per share | $ 1.00 |  |
Dividends payable, date of record | Oct. 20, 2016 |  |
Dividends payable, date to be paid | Nov. 03, 2016 |  |
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 | Feb. 08, 2017 |  |
Dividend paid, amount per share | $ 1.00 |  |
Dividends payable, date of record | Feb. 23, 2017 |  |
Dividends payable, date to be paid | Mar. 09, 2017 |  |

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