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RELATED PARTY TRANSACTION - Narrative (Details) (EMC, Corp., Member of board of directors, USD $)
In Thousands, unless otherwise specified
9 Months Ended
Dec. 31, 2014
EMC, Corp. | Member of board of directors
 
Related Party Transaction [Line Items]  
Revenue $ 208us-gaap_RevenueFromRelatedParties
/ us-gaap_CounterpartyNameAxis
= ntct_EMCCorp.Member
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_DirectorMember