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INCOME TAXES - Schedule of Federal Statutory Income Tax Rate to Effective Tax Rate (Details)
 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Income Tax Disclosure [Abstract]      
Statutory U.S. federal tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State taxes, net of federal tax effect 3.20%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 2.80%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 3.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Research and development tax credits (1.40%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch (1.90%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch (2.10%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch
Tax rate differential of foreign operations 0.10%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential 0.70%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Domestic production activities deduction (2.90%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities (2.70%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities (2.90%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities
Change in valuation allowance 0.40%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 2.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 0.40%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Transaction costs 0.00%ntct_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseTransactionCosts 0.00%ntct_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseTransactionCosts 0.70%ntct_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseTransactionCosts
Other 1.20%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 1.50%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.90%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Total effective income tax rate 35.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations 36.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations 36.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations