Restructuring Costs (Reconciliation Of Company's Liability For The Restructuring Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 5,356	$ 4,831
Payments	(2,787)	(4,014)	$ (315)
Balance	3,415	846	29	$ 344
Employee Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination benefits	5,356	4,608
Payments	(2,564)	(4,014)	(272)
Balance	3,415	623	29	301
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Other restructuring costs	0	223
Payments	(223)	0	(43)
Balance	$ 0	$ 223	$ 0	$ 43