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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.

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