Borrowings (Components of Interest Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Interest expense, borrowings:
Interest expense	$ 45,037	$ 38,825	$ 133,111	$ 109,241
Capitalized interest	(5,775)	(5,055)	(17,943)	(7,701)
Amortization of transaction costs	1,176	909	3,276	2,751
Interest expense resulting from derivatives	$ (465)	$ 148	$ (461)	$ 820