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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Summary of Effect of Foreign Exchange Forward Contracts on Other Comprehensive Income and Results of Operations (Details) - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]        
Reclassified gain (loss) as a result of discontinuance of cash flow hedges $ 0 $ 0 $ 0 $ 0
Forward contracts | Cash flow hedges | Designated as hedging instrument        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in OCI on Derivative (59,000) 415,000 (578,000) 909,000
Gain (Loss) Reclassified from Accumulated OCI into Income 202,000 (379,000) 296,000 (367,000)
Gain (Loss) Recognized in Income (Amount Excluded from Effectiveness Testing) (37,000) (12,000) (79,000) (37,000)
Forward contracts | Cash flow hedges | Designated as hedging instrument | Research and development        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in OCI on Derivative (59,000) 415,000 (578,000) 909,000
Gain (Loss) Reclassified from Accumulated OCI into Income 57,000 (54,000) 87,000 (82,000)
Gain (Loss) Recognized in Income (Amount Excluded from Effectiveness Testing) 16,000 34,000 33,000 37,000
Forward contracts | Cash flow hedges | Designated as hedging instrument | Sales and marketing        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in OCI on Derivative    
Gain (Loss) Reclassified from Accumulated OCI into Income 145,000 (325,000) 209,000 (285,000)
Gain (Loss) Recognized in Income (Amount Excluded from Effectiveness Testing) $ (53,000) $ (46,000) $ (112,000) $ (74,000)