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

The components of net periodic benefit costs are as follows:

 

     Three Months  Ended
October 31,		      Six Months Ended
October 31,		  
     2012      2011      2012      2011  
     (in thousands)  

Interest cost

    $ 756       $ 884       $ 1,512       $ 1,768   

Amortization of actuarial loss

      594         355         1,188         710   
  

 

 

     

 

 

     

 

 

     

 

 

  

Net periodic benefit costs

    $ 1,350       $ 1,239       $ 2,700       $ 2,478