REVENUES FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 31, 2020	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Disaggregation of Revenues
Totals	$ 67,988	$ 58,406	$ 63,059	$ 49,544	$ 87,658	$ 116,459	$ 136,670	$ 141,366	$ 238,997	$ 482,153	$ 892,815
United States
Disaggregation of Revenues
Totals									169,299	371,609	870,029
UK
Disaggregation of Revenues
Totals									49,028	81,319	12,244
Republic of Ireland
Disaggregation of Revenues
Totals									20,342	28,352	$ 10,542
Other
Disaggregation of Revenues
Totals									$ 328	$ 873