ACCUMULATED OTHER COMPREHENSIVE LOSS - Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Changes in Accumulated Other Comprehensive Income by Component
Beginning balance	$ (135,915)	$ (180,505)	$ (126,156)
Other comprehensive gain (loss) before reclassifications	5,727	(5,344)	(85,788)
Net (gains) losses reclassified from accumulated other comprehensive loss	2,045	49,934	31,439
Net current-period other comprehensive (gain) loss	7,772	44,590	(54,349)
Ending balance	(128,143)	(135,915)	(180,505)
Unrealized gain (loss) on derivative instruments and other
Changes in Accumulated Other Comprehensive Income by Component
Beginning balance	(41,522)	(68,266)	(32,849)
Other comprehensive gain (loss) before reclassifications	6,925	(2,199)	(76,470)
Net (gains) losses reclassified from accumulated other comprehensive loss	2,171	28,943	41,053
Net current-period other comprehensive (gain) loss	9,096	26,744	(35,417)
Ending balance	(32,426)	(41,522)	(68,266)
Foreign currency translation adjustments
Changes in Accumulated Other Comprehensive Income by Component
Beginning balance	(94,393)	(112,239)	(93,307)
Other comprehensive gain (loss) before reclassifications	(1,198)	(3,145)	(9,318)
Net (gains) losses reclassified from accumulated other comprehensive loss	(126)	20,991	(9,614)
Net current-period other comprehensive (gain) loss	(1,324)	17,846	(18,932)
Ending balance	$ (95,717)	$ (94,393)	$ (112,239)