REVENUE RECOGNITION REVENUE RECOGNITION - DISAGGREGATION OF REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 287,295	$ 315,259
Recurring revenue
Disaggregation of Revenue [Line Items]
Revenue	185,108	170,175
Nonrecurring revenue
Disaggregation of Revenue [Line Items]
Revenue	102,187	145,084
Product revenue
Disaggregation of Revenue [Line Items]
Revenue	77,284	104,224
Service and support revenue
Disaggregation of Revenue [Line Items]
Revenue	210,011	211,035
Customer Engagement
Disaggregation of Revenue [Line Items]
Revenue	185,865	207,095
Customer Engagement | Recurring revenue
Disaggregation of Revenue [Line Items]
Revenue	129,070	123,358
Customer Engagement | Nonrecurring revenue
Disaggregation of Revenue [Line Items]
Revenue	56,795	83,737
Customer Engagement | Product revenue
Disaggregation of Revenue [Line Items]
Revenue	33,997	54,002
Customer Engagement | Service and support revenue
Disaggregation of Revenue [Line Items]
Revenue	151,868	153,093
Cyber Intelligence
Disaggregation of Revenue [Line Items]
Revenue	101,430	108,164
Cyber Intelligence | Recurring revenue
Disaggregation of Revenue [Line Items]
Revenue	56,038	46,817
Cyber Intelligence | Nonrecurring revenue
Disaggregation of Revenue [Line Items]
Revenue	45,392	61,347
Cyber Intelligence | Product revenue
Disaggregation of Revenue [Line Items]
Revenue	43,287	50,222
Cyber Intelligence | Service and support revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 58,143	$ 57,942