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COMMITMENTS AND CONTINGENCIES - Narrative (Details) (USD $)
Dec. 31, 2014
Mar. 31, 2014
Commitments and Contingencies Disclosure [Line Items]    
Fair value of contingent liability $ 4,445,000us-gaap_BusinessCombinationContingentConsiderationLiability $ 4,291,000us-gaap_BusinessCombinationContingentConsiderationLiability
Contractual non-compliance liabilities incurred by Simena   49,000ntct_BusinessAcquisitionPurchasePriceAllocationCurrentLiabilitiesContractualNonComplianceLiability
Simena LLC    
Commitments and Contingencies Disclosure [Line Items]    
Number of contingent liabilities recorded 2ntct_BusinessCombinationContingentConsiderationNumberofContingentLiabilitiesRecorded
/ dei_LegalEntityAxis
= ntct_SimenaLlcMember
 
Fair value of contingent liability 8,000,000us-gaap_BusinessCombinationContingentConsiderationLiability
/ dei_LegalEntityAxis
= ntct_SimenaLlcMember
 
Contractual non-compliance liabilities incurred by Simena 1,600,000ntct_BusinessAcquisitionPurchasePriceAllocationCurrentLiabilitiesContractualNonComplianceLiability
/ dei_LegalEntityAxis
= ntct_SimenaLlcMember
 
Simena LLC | Present value of future consideration    
Commitments and Contingencies Disclosure [Line Items]    
Fair value of contingent liability 4,400,000us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= ntct_PresentValueOfFutureConsiderationMember
/ dei_LegalEntityAxis
= ntct_SimenaLlcMember
 
Contractual non-compliance liabilities incurred by Simena 0ntct_BusinessAcquisitionPurchasePriceAllocationCurrentLiabilitiesContractualNonComplianceLiability
/ us-gaap_BusinessAcquisitionAxis
= ntct_PresentValueOfFutureConsiderationMember
/ dei_LegalEntityAxis
= ntct_SimenaLlcMember
 
Contingent contractual obligation $ 0us-gaap_ContractualObligation
/ us-gaap_BusinessAcquisitionAxis
= ntct_PresentValueOfFutureConsiderationMember
/ dei_LegalEntityAxis
= ntct_SimenaLlcMember