STOCK-BASED COMPENSATION - Summary of Change in Number of Non-Vested Options to Purchase Shares of Common Stock (Details) - $ / shares shares in Thousands	9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015
STOCK-BASED COMPENSATION
Shares, Nonvested, Beginning balance	300	306
Shares, Granted	105	240
Shares, Vested	(240)	(221)
Shares, Nonvested, Ending balance	165	325
Weighted Average Fair Value, Nonvested, Beginning balance	$ 8.97	$ 7.14
Weighted Average Fair Value, Granted	9.66	9.13
Weighted Average Fair Value, Vested	7.63	6.60
Weighted Average Fair Value, Nonvested, Ending balance	$ 9.17	$ 8.97