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Pension And Other Postretirement Benefit Plans (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Defined Benefit Plan Disclosure [Line Items]      
Revised healthcare cost trend assumption 7.00%    
Ultimate healthcare cost trend rate 4.50%    
Year that rate reaches healthcare cost trend rate 2037    
Effect of one-percentage-point decrease on accumulated postretirement benefit obligation $ 900    
Effect of one-percentage-point increase on accumulated postretirement benefit obligation 1,000    
Net actuarial loss expected in net periodic benefit cost during fiscal year 2014 6,100    
Prior service benefit expected in net periodic benefit cost during fiscal year 2014 $ 2,600    
Percentage of total plan assets 90.00%    
Percentage of total projected benefit obligation 81.00%    
Expected company contributions in 2014 $ 7,300    
Pension and Other Postretirement Benefit Expense 1,800 $ 1,800 $ 1,600
Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Funded status of the plans, end of year $ 57,646 $ 64,355  
Percentage of funded status of plans 58.00%    
Other Postretirement Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Revised healthcare cost trend assumption 7.00% 7.20% 7.40%
Funded status of the plans, end of year $ 35,660 $ 38,748  
Percentage of funded status of plans 83.00%    
Non-ERISA regulated and Other Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Expected company contributions in 2014 $ 1,900    
ERISA-regulated U.S. plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Expected company contributions in 2014 $ 5,400