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Deferred Compensation and Retirement Plans (Tables)
 9 Months Ended
Jan. 31, 2016
Deferred Compensation Plans  
Components Of Net Periodic Benefit Costs

The components of net periodic benefit costs are as follows:

 

     Three Months Ended
January 31,		      Nine Months Ended
January 31,		  
     2016      2015      2016      2015  
     (in thousands)  

Amortization of actuarial loss

    $ 730       $ 763       $ 2,192       $ 2,288   

Interest cost

      703         747         2,109         2,242   
  

 

 

     

 

 

     

 

 

     

 

 

  

Net periodic benefit costs

    $ 1,433       $ 1,510       $ 4,301       $ 4,530