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Deferred Compensation and Retirement Plans (Tables) (Deferred Compensation Plan)
3 Months Ended
Jul. 31, 2012
Deferred Compensation Plan
 
Components Of Net Periodic Benefit Costs

The components of net periodic benefit costs are as follows:

 

     Three Months Ended
July  31,
 
     2012      2011  
     (in thousands)  

Interest cost

   $ 756       $ 884   

Amortization of actuarial loss

     594         355   
  

 

 

    

 

 

 

Net periodic benefit costs

   $ 1,350       $ 1,239