DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Additional Information (Detail)	6 Months Ended
Sep. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Hedging forecasted cash flows for operating expenses denominated in foreign currencies managed in months	12 months
Contract maturing over next months	12 months

Hedging Forecasted Cash Flows For Operating Expenses Denominated In Foreign Currencies Managed In Months

No definition available.

Name:	ntct_HedgingForecastedCashFlowsForOperatingExpensesDenominatedInForeignCurrenciesManagedInMonths
Namespace Prefix:	ntct_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration