Pension And Other Postretirement Benefit Plans (Fair Values Of Assets Under Fair Value Hierarchy) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Total investments	$ 220,336	$ 221,953
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	56,243	58,745
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	151,435	149,252	[1]
Alternative Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	12,658	13,956
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	199,983	201,080
Level 1 [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	56,243	58,745
Level 1 [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	143,740	142,335	[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	0
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	0	[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	20,353	20,873
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	7,695	6,917	[1]
Level 3 [Member] | Alternative Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	$ 12,658	$ 13,956

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