Pension And Other Postretirement Benefit Plans (Benefit Obligations, Plan Assets, And Funded Status) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value, beginning of year	$ 221,953
Plan assets at fair value, end of year	220,336	$ 221,953
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	231,685	235,540
Projected benefit obligation	237,626	241,399	$ 277,050
Projected benefit obligation, beginning of year	241,399	277,050
Service cost	5,214	6,172	6,674
Interest cost	11,566	9,670	8,754
Effect of discount rate change	(5,147)	(31,621)
Foreign currency exchange rate changes	(298)	(543)
Other	2,197	(2,120)
Benefit payments	(17,305)	(17,209)
Projected benefit obligation, end of year	237,626	241,399	277,050
Plan assets at fair value, beginning of year	221,953	256,013
Actual return on plan assets	11,666	(20,613)
Employer contributions	4,257	4,038
Foreign currency exchange rate changes	(235)	(276)
Plan assets at fair value, end of year	220,336	221,953	256,013
Funded status of the plans, end of year	(17,290)	(19,446)
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	20,077	20,716	24,957
Projected benefit obligation, beginning of year	20,716	24,957
Service cost	239	115	170
Interest cost	1,049	944	950
Effect of discount rate change	(255)	(1,906)
Foreign currency exchange rate changes	30	(145)
Other	589	(659)
Benefit payments	(2,291)	(2,590)
Projected benefit obligation, end of year	20,077	20,716	24,957
Plan assets at fair value, beginning of year	2,257	2,706
Actual return on plan assets	174	73
Employer contributions	1,794	2,068
Foreign currency exchange rate changes	0	0
Plan assets at fair value, end of year	1,934	2,257	$ 2,706
Funded status of the plans, end of year	$ (18,143)	$ (18,459)