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INCOME TAXES - Additional Information (Details) - USD ($)
$ in Millions
6 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Jan. 31, 2016
INCOME TAXES      
Federal corporate income tax rate 35.00% 35.00%  
Accrued income taxes included in accrued expenses $ 1.8    
Prepaid income taxes included in prepaid expenses and other current assets     $ 3.3