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Derivatives (Narratives) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
AOCI Attributable To Parent [Abstract]      
Increase (Decrease) in Fair Value of Interest Rate Fair Value Hedging Instruments $ 3,700 $ 6,400 $ 5,000
Interest expense 295,716 256,175 223,958
Reclassified AOCI      
AOCI Attributable To Parent [Abstract]      
Interest expense 10,100 $ 4,100 $ 800
Reclassification net gains Interest Rate Contracts      
AOCI Attributable To Parent [Abstract]      
Interest expense $ 2,700