Disposal Group, Not Discontinued Operation, Change In Amount Of Contingent Consideration, Asset

No definition available.

Name:	ntct_DisposalGroupNotDiscontinuedOperationChangeInAmountOfContingentConsiderationAsset
Namespace Prefix:	ntct_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Disposal Group, Not Discontinued Operation, Change In Amount Of Contingent Consideration, Expense

+ References

No definition available.

+ Details

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

- Definition

Disposal Group, Not Discontinued Operation, Contingent Consideration

+ References

No definition available.

+ Details

Name:	ntct_DisposalGroupNotDiscontinuedOperationContingentConsideration
Namespace Prefix:	ntct_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Disposal Group, Not Discontinued Operation, Contingent Consideration, Measurement Period

+ References

No definition available.

+ Details

Name:	ntct_DisposalGroupNotDiscontinuedOperationContingentConsiderationMeasurementPeriod
Namespace Prefix:	ntct_
Data Type:	xbrli:durationItemType
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_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=ntct_HandheldNetworkTestToolsBusinessMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($)		3 Months Ended	6 Months Ended
FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($)	Sep. 14, 2018	Sep. 30, 2019	Sep. 30, 2019	Mar. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Change in fair value contingent consideration in other expense		$ 500,000
HNT tools business \| Disposed of by Sale
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent consideration related to the divestiture, measurement period	2 years
Change in fair value contingent consideration in other expense			$ 500,000
Disposal group, not discontinued operation, change in amount of contingent consideration, asset		$ 200,000	200,000	$ 800,000
Contingent consideration, change in fair value of contingent consideration			$ 24,000
HNT tools business \| Disposed of by Sale \| Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent consideration related to the divestiture	$ 4,000,000.0