Stockholders' Equity (Narratives) (Details)	6 Months Ended
	Sep. 30, 2017 $ / shares
Stockholders' Equity [Abstract]
Dividends payable, date declared	Jul. 05, 2017
Declared cash dividend, paid	$ 1.00
Dividends payable, date of record	Jul. 20, 2017
Declared dividend, date paid	Aug. 03, 2017