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Pension And Other Postretirement Benefit Plans (Fair Values Of Assets Under Fair Value Hierarchy) (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Mar. 31, 2022
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | $ 221,953 | $ 256,013 |
Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 58,745 | 77,175 |
Fixed Income Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 149,252 | 166,240 | [1]
Alternative Investments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 13,956 | 12,598 |
Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 201,080 | 237,131 |
Level 1 [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 58,745 | 77,175 |
Level 1 [Member] | Fixed Income Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | 142,335 | 159,956 | [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 | 20,873 | 18,882 |
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 | 6,917 | 6,284 | [1]
Level 3 [Member] | Alternative Investments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments | $ 13,956 | $ 12,598 |
[1] | Includes high yield securities and cash and cash equivalent balances.

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