REVENUES FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Disaggregation of Revenues
Consolidated Revenues	$ 87,658	$ 116,459	$ 136,670	$ 141,366	$ 169,578	$ 232,945	$ 259,803	$ 230,489	$ 482,153	$ 892,815	$ 675,047
United States
Disaggregation of Revenues
Consolidated Revenues									371,609	870,029	663,181
United Kingdom
Disaggregation of Revenues
Consolidated Revenues									81,319	12,244	201
Republic of Ireland
Disaggregation of Revenues
Consolidated Revenues									28,352	$ 10,542	11,411
Other
Disaggregation of Revenues
Consolidated Revenues									$ 873		$ 254