Restructuring Costs (Reconciliation Of Company's Liability For The Restructuring Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Restructuring Cost and Reserve [Line Items]
Employee termination benefits	$ 4,000
Restructuring costs	4,831		$ 2,083
Payments	(4,014)	$ (315)	(2,020)
Balance	846	29	344	$ 281
Employee Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination benefits	4,608		2,083
Payments	(4,014)	(272)	(1,861)
Balance	623	29	301	79
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Other restructuring costs	223		0
Payments	0	(43)	(159)
Balance	$ 223	$ 0	$ 43	$ 202