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Employee Benefit Plans (Components of net periodic benefit costs post retirement benefits) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Postemployment Benefits [Abstract] |  |  |  |
Service cost for benefits earned during the period | $ 297 | $ 331 | $ 594 | $ 663
Other components of net periodic benefit costs: |  |  |  |
Interest cost on accumulated postretirement benefit | 368 | 287 | 735 | 574
Other components | (4) | 17 | (6) | 34
Total other components of net periodic benefit costs | 364 | 304 | 729 | 608
Net periodic postretirement benefit cost | $ 661 | $ 635 | $ 1,323 | $ 1,271

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