Borrowings (Components of Interest Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Interest expense, borrowings:
Interest expense	$ 27,441	$ 22,452	$ 77,849	$ 61,756
Capitalized interest	(1,119)	(958)	(3,417)	(2,380)
Amortization of transaction costs	863	807	2,510	2,298
Interest expense resulting from derivatives	1,818	3,106	6,920	9,806
Total interest expense	29,003	25,407	83,862	71,480
Amortization on early extinguishment of debt	499		499
Total	$ 29,502	$ 25,407	$ 84,361	$ 71,480