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

The components of net periodic benefit costs are as follows:

 

     Three Months Ended
July 31,		  
     2016      2015  
     (in thousands)  

Interest cost

    $ 1,062       $ 703   

Amortization of actuarial loss

      763         731   

Service cost

      609         —     

Expected return on plan assets

      (390 )       —     
  

 

 

     

 

 

  

Net periodic benefit costs

    $ 2,044       $ 1,434