STOCK-BASED COMPENSATION - Summary of Change in Number of Non-Vested Options to Purchase Shares of Common Stock (Details) - $ / shares shares in Thousands	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
STOCK-BASED COMPENSATION
Shares, Non-vested, Beginning balance	302	270	300
Shares, Granted	257	302	270
Shares, Vested	(184)	(260)	(300)
Shares, Forfeitures		(10)
Shares, Non-vested, Ending balance	375	302	270
Weighted Average Fair Value, Non-vested, Beginning balance	$ 13.55	$ 14.93	$ 8.97
Weighted Average Fair Value, Granted	9.31	13.55	14.93
Weighted Average Fair Value, Vested	14.75	15.31	8.97
Weighted Average Fair Value, Forfeitures		19.14
Weighted Average Fair Value, Non-vested, Ending balance	$ 10.05	$ 13.55	$ 14.93