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Derivatives (Narratives) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
AOCI Attributable To Parent [Abstract] |  |  |
Interest expense | $ 256,175 | $ 223,958 | $ 167,424
Decrease, fair value, cash flow hedges |  |  |
AOCI Attributable To Parent [Abstract] |  |  |
Interest expense | 6,400 | 5,000 | 500
Reclassified AOCI |  |  |
AOCI Attributable To Parent [Abstract] |  |  |
Interest expense | 4,100 | $ 800 | $ 3,900
Interest rate contracts |  |  |
AOCI Attributable To Parent [Abstract] |  |  |
Investment Income, Net | $ 5,600 |  |

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