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Deferred Compensation and Retirement Plans (Tables)
 9 Months Ended
Jan. 31, 2017
Deferred Compensation Plan  
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,		  
     2017      2016      2017      2016  
     (in thousands)  

Service cost

    $ 1,793      $ —        $ 3,981      $ —    

Interest cost

      1,062        703        3,185        2,109  

Amortization of actuarial loss

      763        730        2,289        2,192  

Expected return on plan assets

      (389 )       —          (1,169 )       —    
  

 

 

     

 

 

     

 

 

     

 

 

  

Net periodic benefit costs

    $ 3,229      $ 1,433      $ 8,286      $ 4,301