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Derivatives (Narratives) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021
AOCI Attributable To Parent [Abstract] |  |  |  |  |
Interest expense | $ 223,958 | $ 167,424 | $ 163,502 |  |
Derivative Fair Value Of Derivative Net [Abstract] |  |  |  |  |
Derivative hedges, net market value | 5,311 | 0 |  | $ 4,300 | $ 7,500
Derivative hedges, notional amount |  |  |  | $ 465,700 | $ 416,700
Amounts reclassified from AOCI to interest expense | 772 | (3,948) | (3,640) |  |
Interest rate contracts |  |  |  |  |
AOCI Attributable To Parent [Abstract] |  |  |  |  |
Interest expense | 3,700 |  |  |  |
Investments, other |  |  |  |  |
Derivative Fair Value Of Derivative Net [Abstract] |  |  |  |  |
Amounts reclassified from AOCI to interest expense | $ 8,900 | $ 3,700 | $ 2,600 |  |

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