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Deferred Compensation And Retirement Plans (Tables)
3 Months Ended
Jul. 31, 2011
Deferred Compensation And Retirement Plans  
Deferred Compensation And Retirement Plans
     Three Months Ended
July  31,
 
     2011      2010  
     (in thousands)  

Service cost

   $ —         $ 34   

Interest cost

     884         925   

Amortization of actuarial loss

     355         105   
  

 

 

    

 

 

 

Net periodic benefit costs

   $ 1,239       $ 1,064