ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Changes in accumulated other comprehensive loss
Balance	$ (15,732)	$ (47,142)
Other comprehensive (loss) income before reclassifications	(16,823)	9,560
Amounts reclassified from accumulated other comprehensive loss	(8,460)	0
Balance	(41,015)	(37,582)
Foreign currency translation adjustments
Changes in accumulated other comprehensive loss
Balance	(4,287)	(47,666)
Other comprehensive (loss) income before reclassifications	(26,817)	9,476
Amounts reclassified from accumulated other comprehensive loss	0	0
Balance	(31,104)	(38,190)
Unrealized gain (loss) on forward contracts
Changes in accumulated other comprehensive loss
Balance	600	600
Other comprehensive (loss) income before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive loss	0	0
Balance	600	600
Unrealized gain (loss) on cross-currency swap
Changes in accumulated other comprehensive loss
Balance	(10,191)
Other comprehensive (loss) income before reclassifications	9,585
Amounts reclassified from accumulated other comprehensive loss	(8,460)
Balance	(9,066)
Unrealized gain (loss) on available-for- sales securities
Changes in accumulated other comprehensive loss
Balance	(1,854)	(76)
Other comprehensive (loss) income before reclassifications	409	84
Amounts reclassified from accumulated other comprehensive loss	0	0
Balance	$ (1,445)	$ 8