NET (LOSS) INCOME PER COMMON SHARE ATTRIBUTABLE TO VERINT SYSTEMS INC. - Calculation of Basic And Diluted Net Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jul. 31, 2021	Apr. 30, 2021	Jul. 31, 2020	Apr. 30, 2020	Jul. 31, 2021	Jul. 31, 2020
Net Income Attributable to Verint Systems Inc. [Abstract]
Net income (loss) from continuing operations	$ 5,316		$ (9,370)		$ 6,410	$ (23,788)
Net income from discontinued operations	0		19,957		0	30,400
Net income	5,316	$ 1,094	10,587	$ (3,975)	6,410	6,612
Net income attributable to Verint Systems Inc.	5,000		8,494		5,799	2,480
Dividends on preferred stock	(5,200)		(2,484)		(8,522)	(2,484)
Net (loss) income attributable to Verint Systems Inc. for basic net income per common share	(200)		6,010		(2,723)	(4)
Dilutive effect of dividends on preferred stock	0		0		0	0
Net (loss) income attributable to Verint Systems Inc. for diluted net income per common share	(200)		6,010		(2,723)	(4)
Net (loss) income attributable to Verint Systems Inc. common shares
Net loss from continuing operations attributable to Verint Systems Inc. common shares	(200)		(12,181)		(2,723)	(26,839)
Net income from discontinued operations attributable to Verint Systems Inc. common shares	$ 0		$ 18,191		$ 0	$ 26,835
Weighted-average shares outstanding:
Basic (in shares)	65,194		64,954		65,417	64,670
Dilutive effect of employee equity award plans (in shares)	0		895		0	0
Dilutive effect of warrants (in shares)	0		0		0	0
Dilutive effect of assumed conversion of preferred stock (in shares)	0		0		0	0
Diluted (in shares)	65,194		65,849		65,417	64,670
Basic net (loss) income per common share attributable to Verint Systems Inc.:
Continuing operations (in dollars per share)	$ 0		$ (0.19)		$ (0.04)	$ (0.42)
Discontinued operations (in dollars per share)	0		0.28		0	0.42
Total basic net (loss) income per common share attributable to Verint Systems Inc. (in dollars per share)	0		0.09		(0.04)	0
Diluted net (loss) income per common share attributable to Verint Systems Inc.:
Continuing operations (in dollars per share)	0		(0.18)		(0.04)	(0.42)
Discontinued operations (in dollars per share)	0		0.27		0	0.42
Total diluted net (loss) income per common share attributable to Verint Systems Inc. (in dollars per share)	$ 0		$ 0.09		$ (0.04)	$ 0
2021 Notes
Weighted-average shares outstanding:
Dilutive effect of convertible senior notes (in shares)	0		0		0	0
2014 Notes
Weighted-average shares outstanding:
Dilutive effect of convertible senior notes (in shares)	0		0		0	0
Continuing Operations
Net Income Attributable to Verint Systems Inc. [Abstract]
Net income attributable to noncontrolling interests	$ 316		$ 327		$ 611	$ 567
Discontinued Operations
Net Income Attributable to Verint Systems Inc. [Abstract]
Net income attributable to noncontrolling interests	$ 0		$ 1,766		$ 0	$ 3,565