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Stockholders' Equity (Narratives) (Details) - $ / shares | 12 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Dividends Declared |  |
Dividends payable, date declared | Mar. 06, 2019 |
Dividend paid, amount per share | $ 0.5 |
Dividends payable, date of record | Mar. 21, 2019 |
Dividends payable, date to be paid | Apr. 04, 2019 |
Dividends declared two [Member] |  |
Dividends Declared |  |
Dividends payable, date declared | Dec. 05, 2018 |
Dividend paid, amount per share | $ 0.5 |
Dividends payable, date of record | Dec. 20, 2018 |
Dividends payable, date to be paid | Jan. 07, 2019 |
Dividends declared three [Member] |  |
Dividends Declared |  |
Dividends payable, date declared | Aug. 23, 2018 |
Dividend paid, amount per share | $ 0.5 |
Dividends payable, date of record | Sep. 10, 2018 |
Dividends payable, date to be paid | Sep. 24, 2018 |
Dividends declared four [Member] |  |
Dividends Declared |  |
Dividends payable, date declared | Jun. 06, 2018 |
Dividend paid, amount per share | $ 0.5 |
Dividends payable, date of record | Jun. 21, 2018 |
Dividends payable, date to be paid | Jul. 05, 2018 |
Dividends declared five [Member] |  |
Dividends Declared |  |
Dividends payable, date declared | Mar. 08, 2018 |
Dividend paid, amount per share | $ 0.5 |
Dividends payable, date of record | Mar. 23, 2018 |
Dividends payable, date to be paid | Apr. 06, 2018 |
Dividends declared six [Member] |  |
Dividends Declared |  |
Dividends payable, date declared |  | Dec. 06, 2017
Dividend paid, amount per share |  | $ 0.5
Dividends payable, date of record |  | Dec. 21, 2017
Dividends payable, date to be paid |  | Jan. 05, 2018
Dividends declared seven [Member] |  |
Dividends Declared |  |
Dividends payable, date declared |  | Jul. 05, 2017
Dividend paid, amount per share |  | $ 1
Dividends payable, date of record |  | Jul. 20, 2017
Dividends payable, date to be paid |  | Aug. 03, 2017

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