QUARTERLY FINANCIAL INFORMATION (unaudited) (Details) - USD ($) $ / shares in Units, $ 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
QUARTERLY FINANCIAL INFORMATION (unaudited)
Revenues	$ 67,988	$ 58,406	$ 63,059	$ 49,544	$ 87,658	$ 116,459	$ 136,670	$ 141,366	$ 238,997	$ 482,153	$ 892,815
Gross (loss) profit	5,249	5,992	2,965	(21,026)	6,746	29,532	30,708	15,452	(6,820)	82,438	149,325
Income (loss) from operations	(9,938)	(6,143)	(7,073)	(32,686)	(4,293)	18,385	20,330	5,815	(55,840)	40,237	106,977
Net (loss) income	$ (7,188)	$ (6,855)	$ 1,154	$ (29,800)	$ (2,207)	$ 32,434	$ 16,972	$ 4,837	$ (42,689)	$ 52,036	$ 72,011
(Loss) income per share
Basic (in Dollars per share)	$ (0.46)	$ (0.44)	$ 0.07	$ (1.91)	$ (0.14)	$ 2.08	$ 1.09	$ 0.31	$ (2.73)	$ 3.34	$ 4.64
Diluted (in Dollars per share)	$ (0.46)	$ (0.44)	$ 0.07	$ (1.91)	$ (0.14)	$ 2.07	$ 1.08	$ 0.31	$ (2.73)	$ 3.32	$ 4.56