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Executive Stock Plans And Stock-Based Compensation (Summary Of Stock Option And SAR Activity) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2010
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Outstanding at beginning of year, Shares 922,598 831,798 719,557
Shares, Granted 170,400 153,600 253,800
Exercised, Shares (195,948)   (132,892)
Cancelled/expired, Shares (41,200) (62,800) (8,667)
Outstanding at end of year, Shares 855,850 922,598 831,798
Exercisable at end of year, Shares 521,444    
Expected to vest in future periods, Shares 334,406    
Outstanding at beginning of year, Weighted-Average Exercise Price $ 45.94 $ 48.36 $ 50.41
Granted, Weighted Average Exercise Price $ 37.86 $ 39.71 $ 35.30
Exercised, Weighted-Average Exercise Price $ 35.82   $ 36.09
Cancelled/expired, Weighted-Average Exercise Price $ 59.25 $ 62.66 $ 24.69
Outstanding at end of year, Weighted-Average Exercise Price $ 46.01 $ 45.94 $ 48.36
Exercisable at end of year, Weighted-Average Exercise Price $ 51.28    
Expected to vest in future periods, Weighted-Average Exercise Price $ 37.79    
Outstanding at end of year, Weighted-Average Contractual Term (in years) 6.08    
Exercisable at end of year, Weighted-Average Contractual Term (in years) 4.54    
Expected to vest in future periods, Weighted-Average Contractual Term (in years) 8.49    
Outstanding at end of year, Aggregate Intrinsic Value $ 4,023    
Exercisable at end of year, Aggregate Intrinsic Value 1,078    
Expected to vest in future periods, Aggregate Intrinsic Value $ 2,944