DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2019
Derivative [Line Items]
Forward contracts to sell foreign currencies	$ 211,668		$ 211,668		$ 116,590
Forward contracts to purchase foreign currencies	40,512		40,512		$ 87,793
Derivative instrument not designated as hedging instruments, gain (loss), net	2,210	$ (247)	(1,087)	$ 2,157
Cash Flow Hedging | Foreign currency forward contracts
Derivative [Line Items]
Derivative, notional amount	$ 115,641		$ 115,641