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FAIR VALUE MEASUREMENTS (Tables)
 12 Months Ended
Jan. 31, 2016
FAIR VALUE MEASUREMENTS [Abstract]  
Summary of financial assets and liabilities, measured at fair value
The following table sets forth the financial assets, measured at fair value, as of January 31, 2016 and January 31, 2015:

  
Fair value measurement at reporting date using
 
  
Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
  
Significant Other
Observable Inputs
(Level 2)
  
Significant
Unobservable Inputs
(Level 3)
 
     
(in thousands)
    
Money market mutual funds as of January 31, 2016
 
$
113,984
       
Money market mutual funds as of January 31, 2015
 
$
98,294
       
Liability related to the interest rate swap as of January 31, 2016
     
$
(675
)
   
Liability related to the  interest rate swap as of January 31, 2015
     
$
(626
)
   
Contingent liability associated with acquisitions as of January 31, 2016
          
—
 
Contingent liability associated with acquisitions as of January 31, 2015
         
$
(750
)
Fair values of the derivative instrument
The fair values of the derivative instrument at January 31, 2016 and January 31, 2015 were as follows (in thousands):

 
Liability
 
   Fair Value 
Balance Sheet
Location
January 31,
2016
 January 31,
2015
 
Derivative instrument:
     
Interest rate swap
Other liabilities  net
 
$
(675
)
 
$
(626
)
Total
  
$
(675
)
 
$
(626
)