(Summary Of Outstanding And Exercisable Stock Options) (Details) - $ / shares shares in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, number of shares	1,375	1,615
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)	4 years 8 months 15 days
Options Outstanding, Weighted-Average Exercise Prices	$ 30.63	$ 30.28
Options exercisable, number of shares	1,375
Options exercisable, weighted-average exercise prices	$ 30.63
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	52
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)	7 months 15 days
Options Outstanding, Weighted-Average Exercise Prices	$ 19.99
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	670
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)	4 years 6 months 32 days
Options Outstanding, Weighted-Average Exercise Prices	$ 26.25
Options Outstanding, Potential Dilution	0.30%
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	653
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)	5 years 1 month 28 days
Options Outstanding, Weighted-Average Exercise Prices	$ 35.97
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	1,375
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)	4 years 8 months 14 days
Options Outstanding, Weighted-Average Exercise Prices	$ 30.63
Options Outstanding, Potential Dilution	0.50%