ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	$ 2,040,580	$ 1,488,970	$ 1,003,728
Other comprehensive (loss) income before reclassifications	(20,273)	(25,600)
Amounts reclassified from accumulated other comprehensive (loss) income	(1,689)	3,726
Tax effect on cross-currency swap	775	417	(2,038)
Balance	2,539,244	2,040,580	1,488,970
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(33,090)	(4,287)
Other comprehensive (loss) income before reclassifications	(27,445)	(28,803)
Amounts reclassified from accumulated other comprehensive (loss) income	0	0
Balance	(60,535)	(33,090)	(4,287)
Unrealized gain (loss) on derivative instruments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	600	600
Other comprehensive (loss) income before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive (loss) income	0	0
Balance	600	600	600
Unrealized gain (loss) on cross-currency swap
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(5,285)	(10,191)
Other comprehensive (loss) income before reclassifications	10,504	763
Amounts reclassified from accumulated other comprehensive (loss) income	(1,689)	3,726
Tax effect on cross-currency swap	775	417
Balance	4,305	(5,285)	(10,191)
Unrealized gain (loss) on available- for-sales securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	586	(1,854)
Other comprehensive (loss) income before reclassifications	(3,332)	2,440
Amounts reclassified from accumulated other comprehensive (loss) income	0	0
Balance	(2,746)	586	(1,854)
Total
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(37,189)	(15,732)	(47,142)
Balance	$ (58,376)	$ (37,189)	$ (15,732)