ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Changes in accumulated other comprehensive loss
Balance	$ (47,142)	$ (37,896)
Other comprehensive income before reclassifications	9,560	(3,427)
Amounts reclassified from accumulated other comprehensive loss	0	4
Balance	(37,582)	(41,319)
Foreign currency translation adjustments
Changes in accumulated other comprehensive loss
Balance	(47,666)	(38,580)
Other comprehensive income before reclassifications	9,476	(3,633)
Amounts reclassified from accumulated other comprehensive loss	0	0
Balance	(38,190)	(42,213)
Unrealized gain (loss) on derivative instruments
Changes in accumulated other comprehensive loss
Balance	600	600
Other comprehensive income before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive loss	0	0
Balance	600	600
Unrealized gain (loss) on available-for-sale securities
Changes in accumulated other comprehensive loss
Balance	(76)	84
Other comprehensive income before reclassifications	84	206
Amounts reclassified from accumulated other comprehensive loss	0	4
Balance	$ 8	$ 294