Earnings Per Share Information about Share Repurchase Plan (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Repurchased And Retired Shares Excluded From Weighted Average Shares Outstanding	2,163	2,855	1,415	1,858
Stock Repurchased and Retired During Period, Value	$ 89,978	$ 90,022	$ 157,978	$ 180,021
Stock Repurchased and Retired During Period, Shares	1,933	1,840	3,189	3,711