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

The components of net periodic benefit costs are as follows:

 

     Three Months Ended
October 31,		      Six Months Ended
October 31,		  
     2016      2015      2016      2015  
     (in thousands)  

Service cost

    $ 1,579       $ —       $ 2,188       $ —   

Interest cost

      1,061         703         2,123         1,406   

Amortization of actuarial loss

      763         731         1,526         1,462   

Expected return on plan assets

      (390 )       —         (780 )       —   
  

 

 

     

 

 

     

 

 

     

 

 

  

Net periodic benefit costs

    $     3,013       $     1,434       $     5,057       $     2,868