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Pension And Other Postretirement Benefit Plans (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Revised healthcare cost trend assumption 6.70%    
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 $ 700    
Effect of one-percentage-point increase on accumulated postretirement benefit obligation 800    
Net actuarial loss expected in net periodic benefit cost during fiscal year 2014 5,200    
Prior service benefit expected in net periodic benefit cost during fiscal year 2014 $ 2,400    
Percentage of total plan assets 94.00%    
Percentage of total projected benefit obligation 83.00%    
Expected company contributions in 2014 $ 7,800    
Pension and Other Postretirement Benefit Expense 2,600 $ 2,400 $ 1,500
Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Funded status of the plans, end of year $ 49,099 $ 57,646  
Percentage of funded status of plans 71.00%    
Other Postretirement Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Revised healthcare cost trend assumption 6.70% 7.00% 7.20%
Funded status of the plans, end of year $ 33,732 $ 35,660  
Percentage of funded status of plans 85.00%    
Non-ERISA regulated and Other Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Expected company contributions in 2014 $ 1,800    
ERISA-regulated U.S. plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Expected company contributions in 2014 $ 6,000