STOCKHOLDERS' EQUITY - TREASURY STOCK (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017
Class of Stock [Line Items]
Treasury shares acquired (in shares)		1,306,000
Cost of treasury stock acquired	$ 278	$ 46,896
Treasury stock, (in shares)	1,661,000	1,654,000
Treasury stock, cost	$ 57,425	$ 57,147
Number of shares of common stock repurchased (in shares)	7,000
Cost of shares of common stock repurchased	$ 300