Borrowings (Components of Interest Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Interest expense, borrowings:
Interest expense	$ 39,804	$ 41,600	$ 78,739	$ 83,511
Capitalized interest	(2,722)	(3,494)	(4,752)	(7,928)
Amortization of transaction costs	1,460	1,458	2,746	2,755
Interest expense resulting from derivatives	1,003	961	1,990	1,708
Total interest expense	$ 39,545	$ 40,525	$ 78,723	$ 80,046