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Stock-Based Compensation (Tables)
 9 Months Ended
Jan. 31, 2019
Stock-Based Compensation [Abstract]  
Restricted Stock Data for Awards Granted
The following table summarizes restricted stock awards we granted:

  
Nine Months Ended
January 31,
 
  
2019
  
2018
 
Restricted Stock:
      
Awards granted
  
406
   
528
 
Weighted average fair value of grant
 
$
63.09
  
$
53.27