Executive Stock Plans And Stock-Based Compensation (Summary Of Stock Option And SAR Activity) (Details) - $ / shares shares in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Outstanding at beginning of year, Weighted-Average Exercise Price	$ 59.96	$ 59.82
Outstanding at beginning of year, Shares	152,201	169,601
Exercised, Shares	(135,334)	(6,200)
Cancelled/expired, Shares	(16,867)	(11,200)
Outstanding at end of year, Shares	0	152,201
Exercised, Weighted-Average Exercise Price	$ 61.72	$ 51.32
Cancelled/expired, Weighted-Average Exercise Price	45.82	62.66
Outstanding at end of year, Weighted-Average Exercise Price	$ 0	$ 59.96