Interest on Borrowings (Components of interest expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Interest expense, borrowings:
Interest expense	$ 229,559	$ 167,618	$ 165,484
Capitalized interest	(11,814)	(9,700)	(11,573)
Amortization of transaction costs	6,987	5,556	5,949
Interest expense resulting rom derivatives	(774)	3,950	3,642
Total interest expense	$ 223,958	$ 167,424	$ 163,502