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Common And Preferred Stock (Narrative) (Details) (USD $)
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2014
Minimum [Member]
Mar. 31, 2014
Maximum [Member]
Mar. 31, 2014
Common Stock [Member]
Mar. 31, 2013
Common Stock [Member]
Mar. 31, 2014
Series A Junior Participating Preferred Stock [Member]
Mar. 31, 2013
Series A Junior Participating Preferred Stock [Member]
Mar. 31, 2014
Series B 6.75% Convertible Perpetual Preferred Stock [Member]
Mar. 31, 2013
Series B 6.75% Convertible Perpetual Preferred Stock [Member]
Mar. 31, 2012
Series B 6.75% Convertible Perpetual Preferred Stock [Member]
Mar. 31, 2011
Series B 6.75% Convertible Perpetual Preferred Stock [Member]
Mar. 31, 2006
Series B 6.75% Convertible Perpetual Preferred Stock [Member]
Class of Stock [Line Items]                            
Common stock, shares authorized 100,000,000         100,000,000 100,000,000              
Stock Repurchase Program, Authorized Amount $ 100,000,000                          
Cost of common stock repurchased under share repurchase program 14,145,000 8,631,000 3,488,000                      
Common stock, shares outstanding 23,216,312         23,216,312 23,343,973              
Weighted-average cost per share $ 59.31 $ 50.94 $ 43.49                      
Number of shares repurchased 238,486 169,432 80,191                      
Preferred stock, shares authorized 5,000,000             500,000 500,000 220,000 220,000      
Preferred stock, shares issued               0 0 219,999 219,999     220,000
Preferred stock, shares outstanding               0 0 219,999 219,999 219,999 219,999  
Preferred stock liquidation price $ 1,000                          
Dividend common stock       0.43                    
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 period         March 15, 2018                  
Preferred stock, conversion rate 21.9648                          
Preferred shares, conversion price $ 45.53                          
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 100,000,000