Borrowings (Components of Interest Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Interest expense, borrowings:
Interest expense	$ 41,371	$ 45,037	$ 124,882	$ 133,111
Capitalized interest	(2,105)	(5,775)	(10,033)	(17,943)
Amortization of transaction costs	1,890	1,176	4,645	3,276
Interest expense resulting from derivatives	972	(465)	2,680	(461)
Total interest expense	$ 42,128	$ 39,973	$ 122,174	$ 117,983