DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Summary of Effect of Foreign Exchange Forward Contracts on Other Comprehensive Income and Results of Operations (Details) - Forward contracts - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivative	$ 236	$ (27)	$ 247	$ (101)
Gain (Loss) Reclassified from Accumulated OCI into Income	(137)	24	(94)	70
Gain Recognized in Income	46	0	46	0
Research and development
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivative	236	(27)	247	(101)
Gain (Loss) Reclassified from Accumulated OCI into Income	(22)	(4)	(13)	(8)
Sales and marketing
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Reclassified from Accumulated OCI into Income	(115)	28	(81)	78
General and administrative
Derivative Instruments, Gain (Loss) [Line Items]
Gain Recognized in Income	$ 46	$ 0	$ 46	$ 0