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FAIR VALUE MEASUREMENTS (Tables)
 6 Months Ended
Jul. 31, 2015
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 July 31, 2015 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 July 31, 2015
 
$
110,476
     
Money market mutual funds as of January 31, 2015
 
$
98,294
     
Liability related to the interest rate swap as of July 31, 2015
     
$
(275
)
  
Liability related to the interest rate swap as of January 31, 2015
     
$
(626
)
  
Contingent liability associated with acquisitions as of July 31, 2015
         
$
-
 
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 July 31, 2015 and January 31, 2015 were as follows (in thousands):
 
 
(Liability) Derivative
 
 Fair Value
   Balance Sheet
Location
July 31,
2015
 
January 31,
2015
 
Derivative instrument:
  
Interest rate swap
Other liabilities
 
$
(275
)
$
(626
)
Total
$
(275
)
$
(626
)