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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