Derivatives (Narratives) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
AOCI Attributable to Parent [Abstract]
Interest expense	$ 67,450	$ 59,041	$ 191,991	$ 166,033
Investment Income, Net			4,600	9,200
Decrease, fair value, cash flow hedges
AOCI Attributable to Parent [Abstract]
Interest expense			2,800	6,500
Reclassified AOCI
AOCI Attributable to Parent [Abstract]
Interest expense			3,000	$ 100
Reclassification net gains Interest Rate Contracts
AOCI Attributable to Parent [Abstract]
Interest expense			$ 5,700