Name:	rdwr_ContingentlyTaxableRetainedEarnings
Namespace Prefix:	rdwr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Corporate statutory tax rate on 2017.

No definition available.

Name:	rdwr_CorporateStatutoryTaxRateOn2017
Namespace Prefix:	rdwr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Corporate statutory tax rate on 2018 and thereafter.

No definition available.

Name:	rdwr_CorporateStatutoryTaxRateOn2018AndThereafter
Namespace Prefix:	rdwr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the amount of tax liability created if the entity were to distribute tax-exempted earnings.

No definition available.

Name:	rdwr_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedTaxLiabilityUndistributedTaxExemptEarnings
Namespace Prefix:	rdwr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Income Taxes [Line Items]

No definition available.

Name:	rdwr_IncomeTaxesLineItems
Namespace Prefix:	rdwr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Percentage Of Income Required To Be Derived From Export For Available Tax Benefits

No definition available.

Name:	rdwr_PercentageOfIncomeRequiredToBeDerivedFromExportForAvailableTaxBenefits
Namespace Prefix:	rdwr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The initial tax exemption period for the applicable Israeli tax law.

No definition available.

Name:	rdwr_TaxExemptPeriod
Namespace Prefix:	rdwr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The effective tax rate reduction period under applicable Israeli tax law.

No definition available.

Name:	rdwr_TaxReductionPeriod
Namespace Prefix:	rdwr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The amount of unrecognized tax benefits derived from interest and exchange rate differences expenses related to prior years' uncertain tax positions.

No definition available.

Name:	rdwr_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodInterestAndExchangeRateDifferencesFromPriorYearTaxPosition
Namespace Prefix:	rdwr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I)
-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319

Name:	us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319

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

Expiration date of each operating loss carryforward included in operating loss carryforward, in CCYY-MM-DD format.

Name:	us-gaap_OperatingLossCarryforwardsExpirationDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

A description of the limitations on the use of all operating loss carryforwards available to reduce future taxable income.

No definition available.

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

Description of the limitation related to use of the tax credit carryforward.

No definition available.

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

Amount of interest expense accrued for an underpayment of income taxes.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319

Name:	us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Name:	us-gaap_StatementScenarioAxis=rdwr_PreferredEnterpriseStatusMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementGeographicalAxis=rdwr_DevelopmentZoneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_TaxPeriodAxis=rdwr_TwoThousandFiveteenAndThereafterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementGeographicalAxis=rdwr_ElsewhereInIsraelMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementScenarioAxis=rdwr_PrivilegedEnterpriseStatusMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_IncomeTaxAuthorityAxis=rdwr_DevelopmentAreaAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_IncomeTaxAuthorityAxis=rdwr_OtherAreaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_IncomeTaxAuthorityAxis=us-gaap_DomesticCountryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementScenarioAxis=rdwr_IsraeliParliamentTaxLawEffectMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementGeographicalAxis=rdwr_DevelopmentZoneOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementScenarioAxis=rdwr_SpecialPreferredEnterpriseStatusMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_IncomeTaxAuthorityAxis=us-gaap_ForeignCountryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=rdwr_UnitedStatesSubsidiaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_TaxPeriodAxis=us-gaap_EarliestTaxYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: