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Fair Value (Tables)
 6 Months Ended
Sep. 30, 2013
Fair Value Disclosures [Abstract]  
Schedule of assets and liabilities measured at fair value
 
       
Fair Value Measurement at September 30, 2013 Using
  
         
Quoted Prices
    
Significant
        
         
in Active
    
Other
    
Significant
  
         
Markets for
    
Observable
    
Unobservable
  
   
September 30,
  
Identical Assets
    
Inputs
    
Inputs
  
 (In thousands)
  
2013
    
(Level 1)
    
(Level 2)
    
(Level 3)
  
 Assets:
                        
    Cash and cash equivalents -
                        
       money market funds
   $ 35,913     $ 35,913     $ -     $ -  
    Short term investments -
                                
       bond mutual funds
     15,486       15,486       -       -  
                                 
    $ 51,399     $ 51,399     $ -     $ -