ACCUMULATED OTHER COMPREHENSIVE LOSS - Changes in AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			$ 3,018,573
Ending balance	$ 3,078,328		3,078,328
Unrealized loss on derivative instruments and other
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(55,574)	$ (48,470)	(35,746)	$ (32,426)
Other comprehensive gain (loss) before reclassifications	(14,683)	(4,643)	(55,396)	(5,488)
Net (gains) losses reclassified from accumulated other comprehensive loss	19,318	(74)	40,203	(15,273)
Net current-period other comprehensive gain (loss)	4,635	(4,717)	(15,193)	(20,761)
Ending balance	(50,939)	(53,187)	(50,939)	(53,187)
Foreign currency translation adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(100,807)	(75,403)	(50,099)	(95,717)
Other comprehensive gain (loss) before reclassifications	(7,777)	7,248	(58,485)	27,562
Net (gains) losses reclassified from accumulated other comprehensive loss	0	244	0	244
Net current-period other comprehensive gain (loss)	(7,777)	7,492	(58,485)	27,806
Ending balance	(108,584)	(67,911)	(108,584)	(67,911)
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(156,381)	(123,873)	(85,845)	(128,143)
Other comprehensive gain (loss) before reclassifications	(22,460)	2,605	(113,881)	22,074
Net (gains) losses reclassified from accumulated other comprehensive loss	19,318	170	40,203	(15,029)
Net current-period other comprehensive gain (loss)	(3,142)	2,775	(73,678)	7,045
Ending balance	$ (159,523)	$ (121,098)	$ (159,523)	$ (121,098)