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Pension And Other Postretirement Benefit Plans (Benefit Obligations, Plan Assets, And Funded Status) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2017
Mar. 31, 2016
Defined Benefit Plan Disclosure [Line Items]          
Plan assets at fair value, beginning of year $ 217,859        
Plan assets at fair value, end of year 220,152 $ 217,859      
Pension Benefits [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Accumulated benefit obligation       $ 266,764 $ 273,479
Projected benefit obligation 275,505 288,908 $ 288,908 269,250 275,505
Projected benefit obligation, beginning of year 275,505 288,908      
Service cost 5,382 5,953 5,099    
Interest cost 10,441 10,037 11,215    
Effect of discount rate change 489 (10,036)      
Foreign currency exchange rate changes (1,111) 330      
Settlements 10,955 0      
Other 4,108 (486)      
Benefit payments (14,609) (19,201)      
Projected benefit obligation, end of year 269,250 275,505 288,908    
Plan assets at fair value, beginning of year 217,859 224,553      
Actual return on plan assets 16,450 61      
Employer contributions 10,676 12,504      
Settlements 10,322 0      
Foreign currency exchange rate changes 97 (58)      
Plan assets at fair value, end of year 220,151 217,859 224,553    
Funded status of the plans, end of year (49,099) (57,646)      
Other Postretirement Benefits [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Projected benefit obligation 37,225 40,863 40,863 $ 36,786 $ 37,225
Projected benefit obligation, beginning of year 37,225 40,863      
Service cost 247 286 347    
Interest cost 1,535 1,539 1,699    
Effect of discount rate change (191) (402)      
Foreign currency exchange rate changes 286 (215)      
Settlements 0 0      
Other 766 (1,104)      
Benefit payments (3,082) (3,742)      
Projected benefit obligation, end of year 36,786 37,225 40,863    
Plan assets at fair value, beginning of year 1,565 2,115      
Actual return on plan assets 71 69      
Employer contributions 4,500 3,123      
Settlements 0 0      
Foreign currency exchange rate changes 0 0      
Plan assets at fair value, end of year 3,054 1,565 $ 2,115    
Funded status of the plans, end of year $ (33,732) $ (35,660)