ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	$ (15,732)	$ (47,142)
Other comprehensive income (loss) before reclassifications	(25,600)	25,942
Amounts reclassified from accumulated other comprehensive income (loss)	3,726	7,506
Tax effect on cross-currency swap	417	(2,038)
Balance	(37,189)	(15,732)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(4,287)	(47,666)
Other comprehensive income (loss) before reclassifications	(28,803)	43,379
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Balance	(33,090)	(4,287)
Unrealized gain (loss) on derivative instruments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	600	600
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Balance	600	600
Unrealized gain (loss) on cross-currency swap
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(10,191)	0
Other comprehensive income (loss) before reclassifications	763	(15,659)
Amounts reclassified from accumulated other comprehensive income (loss)	3,726	7,506
Tax effect on cross-currency swap	417	(2,038)
Balance	(5,285)	(10,191)
Unrealized gain (loss) on available- for-sales securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(1,854)	(76)
Other comprehensive income (loss) before reclassifications	2,440	(1,778)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Balance	$ 586	$ (1,854)