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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, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Postemployment Benefits [Abstract] |  |  |  |
Service cost for benefits earned during the period | $ 246 | $ 297 | $ 491 | $ 594
Other components of net periodic benefit costs: |  |  |  |
Interest cost on accumulated postretirement benefit | 375 | 368 | 750 | 735
Other components | 3 | 4 | 6 | 6
Total other components of net periodic benefit costs | 372 | 364 | 744 | 729
Net periodic postretirement benefit cost | $ 618 | $ 661 | $ 1,235 | $ 1,323

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