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Derivatives (Effect of interest rate contracts on statement of operations) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Effect of Interest rate Contracts [Abstract]      
(Gain) recognized in AOCI on interest rate contracts (effective portion) $ 5,900 $ 4,553 $ 3,071
Gain reclassified from AOCI into income $ 772 $ (3,948) $ (3,640)