Stockholders' Equity (Narratives) (Details) - $ / shares	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Dividends declared one [Member]
Dividends Declared
Dividends payable, date declared	Dec. 04, 2019
Dividend paid, amount per share	$ 0.50
Dividends payable, date of record	Dec. 19, 2019
Dividends payable, date to be paid	Jan. 06, 2020
Dividends declared two [Member]
Dividends Declared
Dividends payable, date declared	Aug. 22, 2019
Dividend paid, amount per share	$ 0.50
Dividends payable, date of record	Sep. 09, 2019
Dividends payable, date to be paid	Sep. 23, 2019
Dividends declared three [Member]
Dividends Declared
Dividends payable, date declared	Mar. 06, 2019
Dividend paid, amount per share	$ 0.50
Dividends payable, date of record	Mar. 21, 2019
Dividends payable, date to be paid	Apr. 04, 2019
Dividends declared four [Member]
Dividends Declared
Dividends payable, date declared		Dec. 05, 2018
Dividend paid, amount per share		$ 0.50
Dividends payable, date of record		Dec. 20, 2018
Dividends payable, date to be paid		Jan. 07, 2019
Dividends declared five [Member]
Dividends Declared
Dividends payable, date declared		Aug. 23, 2018
Dividend paid, amount per share		$ 0.50
Dividends payable, date of record		Sep. 10, 2018
Dividends payable, date to be paid		Sep. 24, 2018
Dividends declared six [Member]
Dividends Declared
Dividends payable, date declared		Jun. 06, 2018
Dividend paid, amount per share		$ 0.50
Dividends payable, date of record		Jun. 21, 2018
Dividends payable, date to be paid		Jul. 05, 2018