BASIS OF PRESENTATION, CONSOLIDATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest income	$ 154	$ 235	$ 368	$ 469
Interest expense	(18,717)	(11,703)	(34,952)	(22,823)
Interest expense, net	$ (18,563)	$ (11,468)	$ (34,584)	$ (22,354)