INTANGIBLE ASSETS AND GOODWILL - GOODWILL (Details) - USD ($) $ in Thousands	9 Months Ended
	Oct. 31, 2016	Jan. 31, 2016
Goodwill activity
Goodwill, gross at the beginning of the period	$ 1,264,422	$ 1,274,041
Accumulated impairment losses	(66,865)	(66,865)
Goodwill, net at the beginning of the period	1,207,176
Business combinations	30,725
Foreign currency translation and other	(40,344)
Goodwill, net, at the end of the period	1,197,557
Customer Engagement
Goodwill activity
Goodwill, gross at the beginning of the period	1,120,762	1,131,249
Accumulated impairment losses	(56,043)	(56,043)
Goodwill, net at the beginning of the period	1,075,206
Business combinations	30,725
Foreign currency translation and other	(41,212)
Goodwill, net, at the end of the period	1,064,719
Cyber Intelligence
Goodwill activity
Goodwill, gross at the beginning of the period	143,660	142,792
Accumulated impairment losses	(10,822)	$ (10,822)
Goodwill, net at the beginning of the period	131,970
Business combinations	0
Foreign currency translation and other	868
Goodwill, net, at the end of the period	$ 132,838