Earnings Per Share Information about Share Repurchase Plan (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Repurchased And Retired Shares Excluded From Weighted Average Shares Outstanding	3,646	4,419	2,161	2,715
Stock Repurchased and Retired During Period, Value	$ 25,000	$ 86,500	$ 182,978	$ 266,522
Stock Repurchased and Retired During Period, Shares	572	1,619	3,761	5,329