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Restructuring Costs (Reconciliation Of Company's Liability For The Restructuring Costs) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Restructuring Cost and Reserve [Line Items]        
Restructuring costs   $ 2,083 $ 1,725  
Payments $ (315) (2,020) (2,338)  
Balance 29 344 281 $ 894
Employee Termination Benefits [Member]        
Restructuring Cost and Reserve [Line Items]        
Employee termination benefits   2,083 1,629  
Payments (272) (1,861) (2,246)  
Balance 29 301 79 696
Other Restructuring [Member]        
Restructuring Cost and Reserve [Line Items]        
Other restructuring costs   0 96  
Payments (43) (159) (92)  
Balance $ 0 $ 43 $ 202 $ 198