CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (19,603)	$ (160,981)	$ (78,766)	$ (56,457)
Other comprehensive income (loss):
Unrealized gains (losses) on available for sale securities, net of tax of $0, $(29), $0 and $43	212	(54)	(467)	79
Amortization of loss on derivative contract, net of tax of $0, $62, $0 and $188	180	116	538	349
Change in other benefit plan minimum liability, net of tax of $0, $0, $0 and $70			70	131
Total comprehensive loss	$ (19,211)	$ (160,919)	$ (78,625)	$ (55,898)