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Derivatives (Narratives) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Mar. 31, 2022 | Mar. 31, 2023
AOCI Attributable To Parent [Abstract] |  |  |  |
Interest expense | $ 60,598 | $ 49,799 |  |
Derivative Fair Value Of Derivative Net [Abstract] |  |  |  |
Derivative hedges, net market value | 9,254 |  |  | $ 5,311
Decrease, fair value, cash flow hedges |  |  |  |
AOCI Attributable To Parent [Abstract] |  |  |  |
Interest expense | 7,500 |  | $ 4,300 |
Reclassified AOCI |  |  |  |
AOCI Attributable To Parent [Abstract] |  |  |  |
Interest expense | 362,400 |  | 465,700 |
Interest rate contracts |  |  |  |
AOCI Attributable To Parent [Abstract] |  |  |  |
Interest expense | 1,500 |  | $ 600 |
Investments, other |  |  |  |
Derivative Fair Value Of Derivative Net [Abstract] |  |  |  |
Derivative hedges, net market value | 3,800 |  |  | 100
Notional amount (lease) |  |  |  | $ 4,800
Amounts reclassified from AOCI to interest expense | $ 900 | $ 400 |  |

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