Income Taxes (Schedule of Components of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Current:
Federal
State	568
Current income tax provision (benefit)	568
Deferred:
Federal	(113,523)	(15,468)	(116,563)
State	(30,299)	(3,127)	(3,058)
Deferred income tax provision (benefit)	(143,822)	(18,595)	(119,621)
Total income tax provision (benefit)	$ (143,254)	$ (18,595)	$ (119,621)