Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Reference 1: 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.7)
-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319

+ Details

Name:	us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of deferred income tax expense (benefit) and income tax credits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

+ Details

Name:	us-gaap_DeferredIncomeTaxesAndTaxCredits
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

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

+ References

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=84230637&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=84230637&loc=d3e32698-109319

+ Details

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

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_IncomeTaxExpenseBenefit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the Federal Transition Tax resulting from the enactment of the 2017 Tax Act in the U.S. in December 2017.

+ References

No definition available.

+ Details

Name:	vrnt_TransitionTaxfrom2017TaxAct
Namespace Prefix:	vrnt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	vrnt_Impactof2017TaxActAxis=vrnt_PriortoEnactmentof2017TaxActMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	vrnt_Impactof2017TaxActAxis=vrnt_SubsequenttoEnactmentof2017TaxActMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	vrnt_Impactof2017TaxActAxis=vrnt_Impactof2017TaxActMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	vrnt_Impactof2017TaxActAxis=vrnt_NetImpactofTransitionTaxMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

INCOME TAXES INCOME TAXES - IMPACT OF 2017 TAX ACT (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
U.S. federal statutory income tax rate (as a percent)		33.80%	35.00%	35.00%
Federal Tax Benefit		$ 4,734	$ (8,179)	$ 2,244
Income Tax Expense (Benefit)		$ 22,354	$ 2,772	$ 952
Provisional Deferred Income Taxes	$ 15,000
Prior to Enactment of 2017 Tax Act
U.S. federal statutory income tax rate (as a percent)		35.00%
Subsequent to Enactment of 2017 Tax Act
U.S. federal statutory income tax rate (as a percent)		21.00%
Impact of 2017 Tax Act
Federal Tax Benefit		$ 5,400
Transition Tax from 2017 Tax Act		230,500
Provisional Deferred Income Taxes		15,000
Net Impact of Transition Tax
Income Tax Expense (Benefit)		$ 0