STOCK-BASED COMPENSATION - Summary of Change in Number of Non-Vested Options to Purchase Shares of Common Stock (Details) - $ / shares shares in Thousands	3 Months Ended
	Apr. 30, 2016	Apr. 30, 2015
STOCK-BASED COMPENSATION
Shares, Nonvested, Beginning balance	300	306
Shares, Granted	75	100
Shares, Vested	(100)	(181)
Shares, Nonvested, Ending balance	275	225
Weighted Average Fair Value, Nonvested, Beginning balance	$ 8.97	$ 7.14
Weighted Average Fair Value, Granted	9.01	8.55
Weighted Average Fair Value, Vested	8.55	6.28
Weighted Average Fair Value, Nonvested, Ending balance	$ 9.13	$ 8.45