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Derivatives (Narratives) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Mar. 31, 2023 | Jun. 30, 2023 | Jun. 30, 2022
AOCI Attributable To Parent [Abstract] |  |  |  |  |  |  |
Interest expense | $ 63,943 | $ 57,193 | $ 124,541 | $ 106,992 |  |  |
Derivative Fair Value Of Derivative Net [Abstract] |  |  |  |  |  |  |
Derivative hedges, net market value | $ 7,200 | $ 6,400 | 7,200 | 6,400 |  |  |
Amounts reclassified from AOCI to interest expense |  |  | $ 1,900 | $ 5,700 | $ 400 |  |
Other Investments [Member] |  |  |  |  |  |  |
Derivative Fair Value Of Derivative Net [Abstract] |  |  |  |  |  |  |
Notional amount (lease) |  |  |  |  |  | $ 4,700 | $ 7,800

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