NET (LOSS) INCOME PER COMMON SHARE ATTRIBUTABLE TO VERINT SYSTEMS INC. NET (LOSS) INCOME PER COMMON SHARE ATTRIBUTABLE TO VERINT SYSTEMS INC. - ANTIDILUTIVE SECURITIES (Details) - shares shares in Thousands	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Stock options and restricted stock-based awards
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive Securities Excluded from Computation of Earnings Per Share, (in shares)	1,187	1,097	596
1.50% convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive Securities Excluded from Computation of Earnings Per Share, (in shares)	6,205	6,205	6,205
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive Securities Excluded from Computation of Earnings Per Share, (in shares)	6,205	6,205	6,205