NET (LOSS) INCOME PER COMMON SHARE ATTRIBUTABLE TO VERINT SYSTEMS INC. NET (LOSS) INCOME PER COMMON SHARE ATTRIBUTABLE TO VERINT SYSTEMS INC. - CALCULATION (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Net (Loss) Income Attributable to Verint Systems Inc. [Abstract]
Net (loss) income	$ 18,286	$ 3,066	$ (5,766)	$ (19,040)	$ 8,459	$ (7,434)	$ (11,078)	$ (16,193)	$ (3,454)	$ (26,246)	$ 22,228
Net income attributable to noncontrolling interest									3,173	3,134	4,590
Net (loss) income attributable to Verint Systems Inc.	$ 17,097	$ 2,489	$ (6,427)	$ (19,786)	$ 8,018	$ (8,237)	$ (11,705)	$ (17,456)	$ (6,627)	$ (29,380)	$ 17,638
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Basic (in shares)									63,312,000	62,593,000	61,813,000
Dilutive effect of employee equity award plans (in shares)									0	0	1,108,000
Dilutive effect of 1.50% convertible senior notes (in shares)									0	0	0
Dilutive effect of warrants (in shares)									0	0	0
Diluted (in shares)									63,312,000	62,593,000	62,921,000
Net (Loss) Income Per Share Attributable to Verint Systems Inc. [Abstract]
Basic (in dollars per share)	$ 0.27	$ 0.04	$ (0.10)	$ (0.32)	$ 0.13	$ (0.13)	$ (0.19)	$ (0.28)	$ (0.10)	$ (0.47)	$ 0.29
Diluted (in dollars per share)	$ 0.26	$ 0.04	$ (0.10)	$ (0.32)	$ 0.13	$ (0.13)	$ (0.19)	$ (0.28)	$ (0.10)	$ (0.47)	$ 0.28