Pension And Other Postretirement Benefit Plans (Fair Values Of Assets Under Fair Value Hierarchy) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Total investments	$ 256,013	$ 270,349
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	77,175	83,135
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	166,240	177,172	[1]
Alternative Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	12,598	10,042
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	237,131	251,336
Level 1 [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	77,175	83,135
Level 1 [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	159,956	168,201	[1]
Level 1 [Member] | Alternative Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	0	0
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	0	2,920
Level 2 [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	0	0
Level 2 [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	0	2,920	[1]
Level 2 [Member] | Alternative Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	0	0
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	18,882	16,093
Level 3 [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	0	0
Level 3 [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	6,284	6,051	[1]
Level 3 [Member] | Alternative Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	$ 12,598	$ 10,042

[1] Includes high yield securities and cash and cash equivalent balances.