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COMMON STOCK (Details) - USD ($)
 12 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2014
COMMON STOCK (Details) [Line Items]      
Treasury Stock, Shares, Acquired 1,254,344 283,979 137,015
Treasury Stock, Value, Acquired, Cost Method (in Dollars) $ 70,208,000 $ 18,238,000 $ 3,486,000
Stock Repurchase Program Number of Additional Shares Authorized to be Repurchased 243,238    
Employee Stock Option [Member]      
COMMON STOCK (Details) [Line Items]      
Treasury Stock, Shares, Acquired 1,555    
Treasury Stock, Value, Acquired, Cost Method (in Dollars) $ 100,000