Common And Preferred Stock (Narrative) (Details) (USD $)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2006
Class of Stock [Line Items]
Common stock, shares authorized	100,000,000
Stock Repurchase Program, Authorized Amount	$ 100,000,000
Cost of common stock repurchased under share repurchase program	31,227,000	14,145,000	8,631,000
Common stock, shares outstanding	22,593,266
Weighted-average cost per share	$ 43.37	$ 59.31	$ 50.94
Number of shares repurchased	719,993	238,486	169,432
Preferred stock, shares authorized	5,000,000
Preferred stock liquidation price	$ 1,000
Series B 6.75% convertible perpetual preferred stock, quarterly dividend rate	6.75%
Preferred stock exceeding percentage on closing price	135.00%
Preferred stock, conversion rate	22.1183
Preferred shares, conversion price	$ 45.21
Stock Repurchase Program, Remaining Authorized Repurchase Amount	67,000,000
Minimum [Member]
Class of Stock [Line Items]
Dividend common stock	$ 0.43
Maximum [Member]
Class of Stock [Line Items]
Preferred stock, conversion period	March 15, 2018
Common Stock [Member]
Class of Stock [Line Items]
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares outstanding	22,593,266	23,216,312
Series A Junior Participating Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares authorized	500,000	500,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Series B 6.75% Convertible Perpetual Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares authorized	220,000	220,000
Preferred stock, shares issued	218,490	219,999			220,000
Preferred stock, shares outstanding	218,490	219,999	219,999	219,999