FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS - ASSETS AND LIABILITIES NOT MEASURED AT FV ON (Details) $ in Millions	Jul. 31, 2019 USD ($)
Fair Value Disclosures - Assets and Liabilities Not Measured at Fair Value [Abstract]
Noncontrollling Equity Investment in Privately-held Comp	$ 3.8

Carrying amount of noncontrolling equity investments in privately-held companies without readily determinable fair values.

No definition available.

Name:	vrnt_NoncontrolllingEquityInvestmentinPrivatelyheldComp
Namespace Prefix:	vrnt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant