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Restructuring Costs (Reconciliation Of Company's Liability For The Restructuring Costs) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Restructuring Cost and Reserve [Line Items]        
Restructuring costs $ 2,083 $ 1,725 $ 4,890  
Payments (2,020) (2,338) (6,182)  
Balance 344 281 894 $ 2,186
Employee Termination Benefits [Member]        
Restructuring Cost and Reserve [Line Items]        
Employee termination benefits 2,083 1,629 4,354  
Payments (1,861) (2,246) (5,684)  
Balance 301 79 696 2,026
Other Restructuring [Member]        
Restructuring Cost and Reserve [Line Items]        
Other restructuring costs 0 96 536  
Payments (159) (92) (498)  
Balance $ 43 $ 202 $ 198 $ 160