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FAIR VALUE MEASUREMENTS (Tables)
 3 Months Ended
Apr. 30, 2016
FAIR VALUE MEASUREMENTS [Abstract]  
Summary of financial assets and liabilities, measured at fair value
The following table sets forth the financial assets and liabilities, measured at fair value, as of April 30, 2016 and January 31, 2016:

  
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 April 30, 2016 (a)
 
$
112,792
        
Money market mutual funds as of January  31, 2016 (a)
 
$
113,984
        
Liability related to the interest rate swap as of April 30, 2016 (b)
     
$
(706
)
   
Liability related to the  interest rate swap as of January 31, 2016 (b)
     
$
(675
)
   
 
(a) Money market mutual funds are recorded at fair value based upon quoted market prices.
(b) The liability related to the interest rate swap is recorded at fair value based upon a valuation model that uses relevant observable market inputs at quoted intervals, such as forward yield curves.
Fair values of the derivative instrument
The fair values of the derivative instrument at April 30, 2016 and January 31, 2016 were as follows (in thousands):

 
  
Liability
 
      
Fair Value
 
 
Balance Sheet
Location
  
April 30,
2016
  
January 31,
2016
 
Derivative instrument:
         
Interest rate swap
 
Other liabilities
  
$
(706
)
 
$
(675
)
Total
    
$
(706
)
 
$
(675
)