ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	$ (47,142)	$ (37,896)
Other comprehensive (loss) income before reclassifications	25,942	(9,255)
Amounts reclassified from accumulated other comprehensive income (loss)	7,506	9
Tax effect on cross-currency swap	(2,038)	0	$ 0
Balance	(15,732)	(47,142)	(37,896)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(47,666)	(38,580)
Other comprehensive (loss) income before reclassifications	43,379	(9,086)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Balance	(4,287)	(47,666)	(38,580)
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 income (loss)	0	0
Balance	600	600	600
Unrealized gain (loss) on cross-currency swap
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	0	0
Other comprehensive (loss) income before reclassifications	(15,659)	0
Amounts reclassified from accumulated other comprehensive income (loss)	7,506	0
Tax effect on cross-currency swap	(2,038)
Balance	(10,191)	0	0
Unrealized gain (loss) on available- for-sales securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(76)	84
Other comprehensive (loss) income before reclassifications	(1,778)	(169)
Amounts reclassified from accumulated other comprehensive income (loss)	0	9
Balance	$ (1,854)	$ (76)	$ 84