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Deferred Compensation and Retirement Plans (Tables)
 3 Months Ended
Jul. 31, 2017
Components of Net Periodic Benefits Costs

The components of net periodic benefit costs are as follows:

 

                                                 
     Three Months Ended
July 31,		  
     2017     2016  
     (in thousands)  

Service cost

    $ 2,126     $ 609  

Interest cost

      959       1,062  

Amortization of actuarial loss

      577       763  

Expected return on plan assets (1)

      (399 )      (390 ) 
  

 

 

    

 

 

  

Net periodic benefit costs

    $ 3,263     $ 2,044  
  

 

 

    

 

 

  

 

(1) The expected long-term rate of return on plan assets is 6.50% for July 31,2017 and 2016.