CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (177,623)	$ (43,999)	$ (266,266)	$ (59,163)
Other comprehensive income (loss):
Unrealized gains (losses) on available for sale securities, net of tax of $0, $0, $0 and $0	119	(627)	280	(679)
Amortization of loss on derivative contract, net of tax of $0, $0, $0 and $0	72	180	143	359
Change in other benefit plan minimum liability, net of tax of $0, $0, $0 and $0				70
Total comprehensive loss	$ (177,432)	$ (44,446)	$ (265,843)	$ (59,413)