Addition In Reserve Equity Instruments Other Than Options Quantity Of Addition

No definition available.

Name:	ntct_AdditionInReserveEquityInstrumentsOtherThanOptionsQuantityOfAddition
Namespace Prefix:	ntct_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Cap on fair value of shares available for purchase by participants.

+ References

No definition available.

+ Details

Name:	ntct_CapOnFairValueOfSharesAvailableForPurchaseByParticipants
Namespace Prefix:	ntct_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Employee Stock Purchase Plan, Number of Shares Purchased by Employee

+ References

No definition available.

+ Details

Name:	ntct_EmployeeStockPurchasePlanNumberOfSharesPurchasedByEmployee
Namespace Prefix:	ntct_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Exercise price of options percentage of fair market value of common stock.

+ References

No definition available.

+ Details

Name:	ntct_ExercisePriceOfOptionsPercentageOfFairMarketValueOfCommonStock
Namespace Prefix:	ntct_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of incentive stock option granted.

+ References

No definition available.

+ Details

Name:	ntct_PercentageOfIncentiveStockOptionGranted
Namespace Prefix:	ntct_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of voting stock.

+ References

No definition available.

+ Details

Name:	ntct_PercentageOfVotingStock
Namespace Prefix:	ntct_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of Annualized Forfeiture Rate For Award Granted

+ References

No definition available.

+ Details

Name:	ntct_PercentageofAnnualizedForfeitureRateForAwardGranted
Namespace Prefix:	ntct_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Reduction In Reserve, Equity Instruments Other Than Options, Quantity Of Reduction

+ References

No definition available.

+ Details

Name:	ntct_ReductionInReserveEquityInstrumentsOtherThanOptionsQuantityOfReduction
Namespace Prefix:	ntct_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Reduction In Reserve, Options, Quantity Of Reduction

+ References

No definition available.

+ Details

Name:	ntct_ReductionInReserveOptionsQuantityOfReduction
Namespace Prefix:	ntct_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Share Based Compensation Arrangement By Share Based Payment Award Performance Measurement Period

+ References

No definition available.

+ Details

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

- Definition

Term of options granted, years

+ References

No definition available.

+ Details

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

- Definition

Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Discount rate from fair value on offering date that participants pay for shares.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPriceOfferingDate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The highest quantity of shares an employee can purchase under the plan per period.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of additional shares authorized for issuance under share-based payment arrangement.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Per share weighted-average price paid for shares purchased on open market for issuance under share-based payment arrangement.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of shares issued under share-based payment arrangement.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_AwardTypeAxis=ntct_PerformanceBasedRestrictedStockUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_EmployeeStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=ntct_IncentiveOptionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=ntct_TwoThousandAndElevenEmployeeStockPurchasePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=ntct_TwentyNineteenAmendedEquityIncentivePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=ntct_TwentyNineteenEquityIncentivePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=ntct_TwoThousandAndSevenEquityIncentivePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_TitleOfIndividualAxis=ntct_IndependentDirectorsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_TitleOfIndividualAxis=ntct_SeniorExecutivesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_TitleOfIndividualAxis=ntct_EmployeesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

STOCK PLANS - Narrative (Details)							3 Months Ended	12 Months Ended				23 Months Ended
STOCK PLANS - Narrative (Details)	Aug. 24, 2022 shares	Sep. 10, 2020 shares	Sep. 12, 2019	Nov. 08, 2018 shares	Mar. 01, 2012 USD ($) shares	Sep. 07, 2011 shares	Mar. 31, 2023 USD ($) $ / shares shares	Mar. 31, 2023 USD ($) $ / shares shares	Mar. 31, 2022	Mar. 31, 2021	Sep. 09, 2020	Aug. 23, 2022
Performance Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award performance measurement period							3 years
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost \| $							$ 135,100,000	$ 135,100,000
Unrecognized cost, period for recognition, years								1 year 4 months 24 days
Employee stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased by employees (in shares)								480,783
Shares issued under ESPP plan, weighted average purchase price per share (in dollars per share) \| $ / shares							$ 29.85	$ 29.85
Shares available for future issuance under the ESPP (in shares)							2,772,615	2,772,615
Maximum \| Incentive options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of options granted, years								5 years
2011 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares available (in shares)	2,000,000			3,000,000		2,500,000
Maximum payroll deductions for purchase of shares by participants					20.00%
Maximum number of shares available for purchased by participants (in shares)					2,000
Cap on fair value of shares available for purchase by participants \| $					$ 25,000
Percentage of common stock price for employees					85.00%
2011 Employee Stock Purchase Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cap on fair value of shares available for purchase by participants \| $					$ 50,000
2019 Amended, Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares available (in shares)	7,000,000	4,700,000
Shares available for future issuance under the ESPP (in shares)	8,764,811
Minimum vesting requirement		1 year
Shares issued in period (in shares)	7,000,000
Shares available for grant (in shares)	1,764,811						6,241,002	6,241,002
Reduction for each share of common stock pursuant to other than option	2.34										2.76	2.32
Addition in reserve equity	2.34
Reduction for each share of common stock pursuant to option			1
2019 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum vesting requirement								4 years
Shares available for grant (in shares)							5,749,471	5,749,471
Percentage of incentive stock option granted								110.00%
2019 Equity Incentive Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of options granted, years								7 years
2019 Equity Incentive Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of fair market value of common stock								100.00%
Percentage of voting stock								10.00%
2007 Equity Incentive Plan \| Independent Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of annualized forfeiture rate for awards granted								0.00%	0.00%	0.00%
2007 Equity Incentive Plan \| Senior Executives
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of annualized forfeiture rate for awards granted								2.00%	2.00%	2.00%
2007 Equity Incentive Plan \| Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of annualized forfeiture rate for awards granted								5.00%	5.00%	5.00%