(Summary Of Outstanding And Exercisable Stock Options) (Details) - $ / shares shares in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, number of shares	1,074	1,375
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)	3 years 10 months 20 days
Options Outstanding, Weighted-Average Exercise Prices	$ 30.85	$ 30.63
Options exercisable, number of shares	1,074
Options exercisable, weighted-average exercise prices	$ 30.85
Eleven Point Five Three To Twenty Two Point Four Two [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, number of shares	7
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)	1 year 9 months 21 days
Options Outstanding, Weighted-Average Exercise Prices	$ 16.80
Options Outstanding, Potential Dilution	0.00%
Twenty Six Point Two Five To Twenty Six Point Two Five [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, number of shares	550
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)	3 years 7 months 2 days
Options Outstanding, Weighted-Average Exercise Prices	$ 26.25
Options Outstanding, Potential Dilution	0.20%
Thirty Three Point Six Zero To Thirty Seven Point One Two [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, number of shares	517
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)	4 years 2 months 23 days
Options Outstanding, Weighted-Average Exercise Prices	$ 35.92
Options Outstanding, Potential Dilution	0.20%
Eleven Point Five Three To Thirty Seven Point One Two [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, number of shares	1,074
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)	3 years 10 months 20 days
Options Outstanding, Weighted-Average Exercise Prices	$ 30.85
Options Outstanding, Potential Dilution	0.40%