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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Summary of Notional Amounts and Fair Values of Derivative Instruments on Consolidated Balance Sheet (Details) (Forward contracts, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Mar. 31, 2014
Derivatives, Fair Value [Line Items]    
Notional Amounts $ 19,776invest_DerivativeNotionalAmount [1] $ 17,483invest_DerivativeNotionalAmount [1]
Other Current Assets
   
Derivatives, Fair Value [Line Items]    
Other Current Assets 16us-gaap_DerivativeInstrumentsInHedgesAssetsAtFairValue
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
368us-gaap_DerivativeInstrumentsInHedgesAssetsAtFairValue
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
Accrued Other Liabilities
   
Derivatives, Fair Value [Line Items]    
Accrued Other Liabilities $ 1,223us-gaap_DerivativeInstrumentsInHedgesLiabilitiesAtFairValue
/ us-gaap_BalanceSheetLocationAxis
= ntct_AccruedOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
$ 139us-gaap_DerivativeInstrumentsInHedgesLiabilitiesAtFairValue
/ us-gaap_BalanceSheetLocationAxis
= ntct_AccruedOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
[1] Notional amounts represent the gross contract/notional amount of the derivatives outstanding.