ACCUMULATED OTHER COMPREHENSIVE LOSS - Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Changes in Accumulated Other Comprehensive Income by Component
Beginning balance	$ (128,143)	$ (135,915)	$ (180,505)
Other comprehensive gain (loss) before reclassifications	61,689	5,727	(5,344)
Net (gains) losses reclassified from accumulated other comprehensive loss	(19,391)	2,045	49,934
Net current-period other comprehensive gain (loss)	42,298	7,772	44,590
Ending balance	(85,845)	(128,143)	(135,915)
Unrealized gain (loss) on derivative instruments and other
Changes in Accumulated Other Comprehensive Income by Component
Beginning balance	(32,426)	(41,522)	(68,266)
Other comprehensive gain (loss) before reclassifications	15,667	6,925	(2,199)
Net (gains) losses reclassified from accumulated other comprehensive loss	(18,987)	2,171	28,943
Net current-period other comprehensive gain (loss)	(3,320)	9,096	26,744
Ending balance	(35,746)	(32,426)	(41,522)
Foreign currency translation adjustments
Changes in Accumulated Other Comprehensive Income by Component
Beginning balance	(95,717)	(94,393)	(112,239)
Other comprehensive gain (loss) before reclassifications	46,022	(1,198)	(3,145)
Net (gains) losses reclassified from accumulated other comprehensive loss	(404)	(126)	20,991
Net current-period other comprehensive gain (loss)	45,618	(1,324)	17,846
Ending balance	$ (50,099)	$ (95,717)	$ (94,393)