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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 9 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
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 (113,000) (488,000) 796,000 (626,000)
Gain (Loss) Reclassified from Accumulated OCI into Income (253,000) 193,000 (620,000) 204,000
Gain (Loss) Recognized in Income (Amount Excluded from Effectiveness Testing) (19,000) 18,000 (56,000) (43,000)
Forward contracts | Cash flow hedges | Designated as hedging instrument | Research and development        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Reclassified from Accumulated OCI into Income (24,000) 12,000 (106,000) (6,000)
Gain (Loss) Recognized in Income (Amount Excluded from Effectiveness Testing) 9,000 39,000 46,000 70,000
Forward contracts | Cash flow hedges | Designated as hedging instrument | Sales and marketing        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Reclassified from Accumulated OCI into Income (229,000) 181,000 (514,000) 210,000
Gain (Loss) Recognized in Income (Amount Excluded from Effectiveness Testing) $ (28,000) $ (21,000) $ (102,000) $ (113,000)