Condensed Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Condensed Statements of Comprehensive Income (Loss) [Abstract]
Net income (loss)	$ 50,735	$ (12,388)	$ (80,716)	$ (48,480)
Other comprehensive income (loss):
Unrealized gain (loss) on available for sale debt securities of the Joint Venture, net of taxes	134		1,307
Changes in fair value of interest rate swap, net of taxes	1,313	(6,543)	(5,428)	(3,793)
Foreign currency translation adjustment of the Joint Venture	1,728	(2,418)	3,537	(4,445)
Other comprehensive income (loss)	3,175	(8,961)	(584)	(8,238)
Total comprehensive income (loss)	$ 53,910	$ (21,349)	$ (81,300)	$ (56,718)