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, 2013	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Shares		170,400	153,600
Exercised, Shares	(407,758)	(195,948)
Cancelled/expired, Shares	(29,615)	(41,200)	(62,800)
Outstanding at end of year, Shares	418,477	855,850	922,598	831,798
Exercisable at end of year, Shares	270,201
Expected to vest in future periods, Shares	148,276
Outstanding at beginning of year, Weighted-Average Exercise Price	$ 46.01	$ 45.94	$ 48.36
Granted, Weighted Average Exercise Price		$ 37.86	$ 39.71
Exercised, Weighted-Average Exercise Price	$ 41.21	$ 35.82
Cancelled/expired, Weighted-Average Exercise Price	$ 54.83	$ 59.25	$ 62.66
Outstanding at end of year, Weighted-Average Exercise Price	$ 50.07	$ 46.01	$ 45.94
Exercisable at end of year, Weighted-Average Exercise Price	$ 56.48
Expected to vest in future periods, Weighted-Average Exercise Price	$ 38.39
Outstanding at end of year, Weighted-Average Contractual Term	5 years 3 months 14 days
Exercisable at end of year, Weighted-Average Contractual Term	3 years 10 months 6 days
Expected to vest in future periods, Weighted-Average Contractual Term	7 years 11 months 1 day
Outstanding at end of year, Aggregate Intrinsic Value	$ 3,617
Exercisable at end of year, Aggregate Intrinsic Value	999
Expected to vest in future periods, Aggregate Intrinsic Value	$ 2,618