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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 ($)
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) reclassified as a result of discontinuance of cash flow hedges $ 0 $ 0
Designated as Hedging Instrument | Cash Flow Hedging | Forward contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in OCI on Derivative (696,000) 1,079,000
Gain (Loss) Reclassified from Accumulated OCI into Income 575,000 (900,000)
Gain (Loss) Recognized in Income (Amount Excluded from Effectiveness Testing) (127,000) (93,000)
Designated as Hedging Instrument | Cash Flow Hedging | Forward contracts | Research and development    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized in OCI on Derivative (696,000) 1,079,000
Gain (Loss) Reclassified from Accumulated OCI into Income 164,000 (121,000)
Gain (Loss) Recognized in Income (Amount Excluded from Effectiveness Testing) 69,000 60,000
Designated as Hedging Instrument | Cash Flow Hedging | Forward contracts | Sales and marketing    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Reclassified from Accumulated OCI into Income 411,000 (779,000)
Gain (Loss) Recognized in Income (Amount Excluded from Effectiveness Testing) $ (196,000) $ (153,000)