INTANGIBLE ASSETS AND GOODWILL - GOODWILL (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 30, 2016
Jan. 31, 2016
Goodwill activity    
Goodwill, gross at the beginning of the period $ 1,314,975 $ 1,274,041
Accumulated impairment losses (66,865) (66,865)
Goodwill, net at the beginning of the period 1,207,176  
Business combinations 30,612  
Foreign currency translation and other 10,322  
Goodwill, net, at the end of the period 1,248,110  
Enterprise Intelligence    
Goodwill activity    
Goodwill, gross at the beginning of the period 1,119,434 1,079,746
Accumulated impairment losses (30,791) (30,791)
Goodwill, net at the beginning of the period 1,048,955  
Business combinations 30,612  
Foreign currency translation and other 9,076  
Goodwill, net, at the end of the period 1,088,643  
Cyber Intelligence    
Goodwill activity    
Goodwill, gross at the beginning of the period 121,236 120,719
Accumulated impairment losses 0 0
Goodwill, net at the beginning of the period 120,719  
Business combinations 0  
Foreign currency translation and other 517  
Goodwill, net, at the end of the period 121,236  
Video Intelligence    
Goodwill activity    
Goodwill, gross at the beginning of the period 74,305 73,576
Accumulated impairment losses (36,074) $ (36,074)
Goodwill, net at the beginning of the period 37,502  
Business combinations 0  
Foreign currency translation and other 729  
Goodwill, net, at the end of the period $ 38,231