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

The components of net periodic benefit costs are as follows:

 

                                                                           
             Three Months Ended        
October  31,		             Six Months Ended        
October  31,		  
     2017     2016     2017     2016  
     (in thousands)  

Service cost

    $ 3,165     $ 1,579     $ 5,291     $ 2,188  

Interest cost

      959       1,061       1,918       2,123  

Amortization of actuarial loss

      577       763       1,154       1,526  

Expected return on plan assets (1)

      (398 )      (390 )      (797 )      (780 ) 
  

 

 

    

 

 

    

 

 

    

 

 

  

Net periodic benefit costs

    $ 4,303     $ 3,013     $ 7,566     $ 5,057  
  

 

 

    

 

 

    

 

 

    

 

 

  

 

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