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Deferred Compensation and Retirement Plans (Tables)
 9 Months Ended
Jan. 31, 2018
Components of Net Periodic Benefits Costs

The components of net periodic benefit costs are as follows:

 

             Three Months Ended         
January 31,		             Nine Months Ended         
January 31,		  
     2018     2017     2018     2017  
     (in thousands)  

Service cost

    $ 3,235     $ 1,793     $ 8,526     $ 3,981  

Interest cost

      958       1,062       2,876       3,185  

Amortization of actuarial loss

      577       763       1,731       2,289  

Expected return on plan assets (1)

      (398 )      (389 )      (1,195 )      (1,169 ) 
  

 

 

    

 

 

    

 

 

    

 

 

  

Net periodic benefit costs

    $ 4,372     $ 3,229     $ 11,938     $ 8,286  
  

 

 

    

 

 

    

 

 

    

 

 

  

 

(1) The expected long-term rate of return on plan assets is 6.50% for January 31, 2018 and 2017.