Common And Preferred Stock (Schedule Of Repurchases Of Shares) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Class of Stock [Line Items]
Number of shares repurchased	719,993	238,486	169,432
Cost of shares repurchased (in thousands of dollars)	$ 31,227	$ 14,145	$ 8,631
Weighted-average cost per share	$ 43.37	$ 59.31	$ 50.94
Series B Preferred Stock [Member]
Class of Stock [Line Items]
Number of shares repurchased	1,509	0	0
Weighted-average cost per share	$ 992.27	$ 0.00
Stock Repurchased and Retired During Period, Cost Value	$ 1,497	$ 0	$ 0