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, 2015	Mar. 31, 2014	Mar. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Outstanding at beginning of year, Weighted-Average Exercise Price	$ 54.83	$ 50.07	$ 46.01
Outstanding at beginning of year, Shares	257,340	418,477	855,850
Exercised, Shares	(63,539)	(161,137)	(407,758)
Cancelled/expired, Shares	(24,200)		(29,615)
Outstanding at end of year, Shares	169,601	257,340	418,477
Exercised, Weighted-Average Exercise Price	$ 38.50	$ 42.48	$ 41.21
Cancelled/expired, Weighted-Average Exercise Price	$ 62.66		$ 54.83
Outstanding at end of year, Weighted-Average Exercise Price	$ 59.82	$ 54.83	$ 50.07
Outstanding at end of year, Weighted-Average Contractual Term	2 years 25 days
Outstanding at end of year, Aggregate Intrinsic Value	$ 144