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Stock-Based Compensation (Tables)
6 Months Ended
Oct. 31, 2017
Stock-Based Compensation [Abstract]  
Schedule of Restricted Stock Data for Awards Granted
The following table summarizes restricted stock awards granted by the Company:
 
 
Six Months
Ended October 31,
 
 
2017
 
2016
 
Restricted Stock:
    
Awards granted (in thousands)
  
405
   
509
 
Weighted average fair value of grant
 
$
51.44
  
$
50.56