ACCUMULATED OTHER COMPREHENSIVE LOSS - Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ (85,845)	$ (128,143)	$ (135,915)
Other comprehensive gain (loss) before reclassifications	(107,810)	61,689	5,727
Net (gains) losses reclassified from accumulated other comprehensive loss	42,492	(19,391)	2,045
Net current-period other comprehensive gain (loss)	(65,318)	42,298	7,772
Ending balance	(151,163)	(85,845)	(128,143)
Unrealized Gain (Loss) on Derivative Instruments And Other
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(35,746)	(32,426)	(41,522)
Other comprehensive gain (loss) before reclassifications	(48,302)	15,667	6,925
Net (gains) losses reclassified from accumulated other comprehensive loss	42,492	(18,987)	2,171
Net current-period other comprehensive gain (loss)	(5,810)	(3,320)	9,096
Ending balance	(41,556)	(35,746)	(32,426)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(50,099)	(95,717)	(94,393)
Other comprehensive gain (loss) before reclassifications	(59,508)	46,022	(1,198)
Net (gains) losses reclassified from accumulated other comprehensive loss	0	(404)	(126)
Net current-period other comprehensive gain (loss)	(59,508)	45,618	(1,324)
Ending balance	$ (109,607)	$ (50,099)	$ (95,717)