Interest on Borrowings (Components of interest expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Interest expense, borrowings:
Interest expense	$ 167,618	$ 165,484	$ 180,444
Capitalized interest	(9,700)	(11,573)	(23,517)
Amortization of transaction costs	5,556	5,949	4,427
Interest expense resulting rom derivatives	3,950	3,642	(404)
Total interest expense	$ 167,424	$ 163,502	$ 160,950