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FAIR VALUE MEASUREMENTS - Narrative (Details) (USD $)
12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Recognized adjustment earnings $ 9,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings $ 303,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings  
Fair value assumption, discount rate 3.30%us-gaap_FairValueInputsDiscountRate 3.30%us-gaap_FairValueInputsDiscountRate  
Deal related compensation expense and accretion charges 153,000ntct_AcquisitionRelatedCompensationExpenseAndAccretionCharges 151,000ntct_AcquisitionRelatedCompensationExpenseAndAccretionCharges 263,000ntct_AcquisitionRelatedCompensationExpenseAndAccretionCharges
Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Contingent contractual obligation 0us-gaap_ContractualObligation
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
   
Contingent Purchase Consideration      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Contingent purchase consideration payment   $ 841,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ntct_ContingentPurchaseConsiderationMember
 
Minimum      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value assumption, period   2 years  
Maximum      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value assumption, period   3 years