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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, 2016
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2016
Mar. 31, 2015
Defined Benefit Plan Disclosure [Line Items]          
Plan assets at fair value, beginning of year $ 224,553        
Plan assets at fair value, end of year 217,859 $ 224,553      
Pension Benefits [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Accumulated benefit obligation       $ 273,479 $ 287,133
Projected benefit obligation 288,908 259,928 $ 259,928 275,505 288,908
Projected benefit obligation, beginning of year 288,908 259,928      
Service cost 5,953 5,099 5,190    
Interest cost 10,037 11,215 12,223    
Effect of discount rate change (10,036) 30,744      
Foreign currency exchange rate changes 330 (6,033)      
Curtailments 0 0      
Other (486) 2,879      
Benefit payments (19,201) (14,924)      
Projected benefit obligation, end of year 275,505 288,908 259,928    
Plan assets at fair value, beginning of year 224,553 213,282      
Actual return on plan assets 61 23,486      
Employer contributions 12,504 8,063      
Foreign currency exchange rate changes (58) (5,354)      
Plan assets at fair value, end of year 217,859 224,553 213,282    
Funded status of the plans, end of year (57,646) (64,355)      
Other Postretirement Benefits [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Projected benefit obligation 40,863 41,846 41,846 $ 37,225 $ 40,863
Projected benefit obligation, beginning of year 40,863 41,846      
Service cost 286 347 527    
Interest cost 1,539 1,699 2,106    
Effect of discount rate change (402) 2,669      
Foreign currency exchange rate changes (215) (444)      
Curtailments 0 (1,465)      
Other (1,104) (788)      
Benefit payments (3,742) (3,001)      
Projected benefit obligation, end of year 37,225 40,863 41,846    
Plan assets at fair value, beginning of year 2,115 2,535      
Actual return on plan assets 69 73      
Employer contributions 3,123 2,508      
Foreign currency exchange rate changes 0 0      
Plan assets at fair value, end of year 1,565 2,115 $ 2,535    
Funded status of the plans, end of year $ (35,660) $ (38,748)