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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, 2018
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2018
Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]          
Plan assets at fair value, beginning of year $ 220,151        
Plan assets at fair value, end of year 229,568 $ 220,151      
Pension Benefits [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Accumulated benefit obligation       $ 270,666 $ 266,764
Projected benefit obligation 269,250 275,505 $ 275,505 273,658 269,250
Projected benefit obligation, beginning of year 269,250 275,505      
Service cost 5,177 5,382 5,953    
Interest cost 10,801 10,441 10,037    
Effect of discount rate change 1,209 489      
Foreign currency exchange rate changes 1,268 (1,111)      
Settlements 0 (10,955)      
Other 781 4,108      
Benefit payments (14,828) (14,609)      
Projected benefit obligation, end of year 273,658 269,250 275,505    
Plan assets at fair value, beginning of year 220,151 217,859      
Actual return on plan assets 15,902 16,450      
Employer contributions 7,891 10,676      
Settlements 0 10,322      
Foreign currency exchange rate changes 452 97      
Plan assets at fair value, end of year 229,568 220,151 217,859    
Funded status of the plans, end of year (44,090) (49,099)      
Other Postretirement Benefits [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Projected benefit obligation 36,786 37,225 37,225 $ 32,945 $ 36,786
Projected benefit obligation, beginning of year 36,786 37,225      
Service cost 229 247 286    
Interest cost 1,471 1,535 1,539    
Effect of discount rate change 612 (191)      
Foreign currency exchange rate changes (151) 286      
Settlements 0 0      
Other (3,212) 766      
Benefit payments (2,790) (3,082)      
Projected benefit obligation, end of year 32,945 36,786 37,225    
Plan assets at fair value, beginning of year 3,054 1,565      
Actual return on plan assets 105 71      
Employer contributions 3,098 4,500      
Settlements 0 0      
Foreign currency exchange rate changes 0 0      
Plan assets at fair value, end of year 3,467 3,054 $ 1,565    
Funded status of the plans, end of year $ (29,478) $ (33,732)