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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, 2025
Mar. 31, 2024
Mar. 31, 2023
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value, beginning of year $ 220,336    
Plan assets at fair value, end of year 171,031 $ 220,336  
Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation 180,725 231,685  
Projected benefit obligation 187,918 237,626 $ 241,399
Projected benefit obligation, beginning of year 237,626 241,399  
Service cost 5,192 5,214 6,172
Interest cost 11,943 11,566 9,670
Effect of discount rate change (4,710) (5,147)  
Foreign currency exchange rate changes (146) (298)  
Settlements (46,714) 0  
Other 232 2,197  
Benefit payments (15,505) (17,305)  
Projected benefit obligation, end of year 187,918 237,626 241,399
Plan assets at fair value, beginning of year 220,336 221,953  
Actual return on plan assets 9,766 11,666  
Employer contributions 3,290 4,257  
Foreign currency exchange rate changes (142) (235)  
Plan assets at fair value, end of year 171,031 220,336 221,953
Funded status of the plans, end of year (16,887) (17,290)  
Other Postretirement Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation 18,134 20,077 20,716
Projected benefit obligation, beginning of year 20,077 20,716  
Service cost 75 239 115
Interest cost 1,062 1,049 944
Effect of discount rate change (469) (255)  
Foreign currency exchange rate changes (325) 30  
Settlements 0 0  
Other 247 589  
Benefit payments (2,533) (2,291)  
Projected benefit obligation, end of year 18,134 20,077 20,716
Plan assets at fair value, beginning of year 1,934 2,257  
Actual return on plan assets 53 174  
Employer contributions 2,083 1,794  
Foreign currency exchange rate changes 0 0  
Plan assets at fair value, end of year 1,537 1,934 $ 2,257
Funded status of the plans, end of year $ (16,597) $ (18,143)