Pension And Other Postretirement Benefit Plans (Benefit Obligations, Plan Assets, And Funded Status) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2020	Mar. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value, beginning of year	$ 244,969
Plan assets at fair value, end of year	238,450	$ 244,969
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation				$ 281,242	$ 273,370
Projected benefit obligation	287,082	273,658	$ 273,658	287,082	278,189
Projected benefit obligation, beginning of year	278,189	273,658
Service cost	5,990	6,008	5,177
Interest cost	10,747	10,810	10,801
Effect of discount rate change	14,479	5,177
Foreign currency exchange rate changes	(1,477)	(2,526)
Settlements	(6,038)	0
Other	1,029	7,268
Benefit payments	(15,837)	(22,206)
Projected benefit obligation, end of year	287,082	278,189	273,658
Plan assets at fair value, beginning of year	244,969	229,568
Actual return on plan assets	10,551	9,772
Employer contributions	6,037	29,489
Settlements	6,038	0
Foreign currency exchange rate changes	(1,232)	(1,654)
Plan assets at fair value, end of year	238,450	244,969	229,568
Funded status of the plans, end of year	(48,632)	(33,220)
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	31,635	31,635	32,945	$ 30,282	$ 31,635
Projected benefit obligation, beginning of year	31,635	32,945
Service cost	199	222	229
Interest cost	1,306	1,371	1,471
Effect of discount rate change	1,326	563
Foreign currency exchange rate changes	(1,012)	(447)
Settlements	0	0
Other	(744)	(126)
Benefit payments	(2,428)	(2,893)
Projected benefit obligation, end of year	30,282	31,635	32,945
Plan assets at fair value, beginning of year	3,717	3,467
Actual return on plan assets	152	150
Employer contributions	1,928	2,993
Settlements	0	0
Foreign currency exchange rate changes	0	0
Plan assets at fair value, end of year	3,369	3,717	$ 3,467
Funded status of the plans, end of year	$ (26,913)	$ (27,918)