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Derivatives (Narratives) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
AOCI Attributable To Parent [Abstract] |  |  |
Increase (Decrease) in Fair Value of Interest Rate Fair Value Hedging Instruments | $ 3,700 | $ 6,400 | $ 5,000
Interest expense | 295,716 | 256,175 | 223,958
Reclassified AOCI |  |  |
AOCI Attributable To Parent [Abstract] |  |  |
Interest expense | 10,100 | $ 4,100 | $ 800
Reclassification net gains Interest Rate Contracts |  |  |
AOCI Attributable To Parent [Abstract] |  |  |
Interest expense | $ 2,700 |  |

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