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Capital Stock and Changes in Capital Accounts (Tables)
 3 Months Ended
Jul. 31, 2019
Capital Stock and Changes in Capital Accounts [Abstract]  
Summary of Changes of Common Stock and Common Stock in Treasury The following is a summary of changes during the three months ended July 31, in shares of our common stock and common stock in treasury (shares in thousands).

Changes in Common Stock A:
  
2019
    
2018
  
Number of shares, beginning of year
    
70,127
      
70,111
  
Common stock class conversions
    
12
      
4
  
Number of shares issued, end of period
    
70,139
      
70,115
  
                 
Changes in Common Stock A in treasury:
                
Number of shares held, beginning of year
    
22,634
      
21,853
  
Purchase of treasury shares
    
218
      
126
  
Restricted shares issued under stock-based compensation plans - non-PSU Awards
    
(36
)
    
(22
)
Restricted shares issued under stock-based compensation plans - PSU Awards
    
(43
)
    
(59
)
Restricted shares, forfeited
    
1
      
—
  
Restricted shares issued from exercise of stock options
    
(12
)
    
(221
)
Shares withheld for taxes
    
33
      
41
  
Other
    
—
      
4
  
Number of shares held, end of period
    
22,795
      
21,722
  
Number of Common Stock A outstanding, end of period
    
47,344
      
48,393
  

Changes in Common Stock B:
  
2019
    
2018
  
Number of shares, beginning of year
    
13,055
      
13,071
  
Common stock class conversions
    
(12
)
    
(4
)
Number of shares issued, end of period
    
13,043
      
13,067
  
                 
Changes in Common Stock B in treasury:
                
Number of shares held, beginning of year
    
3,918
      
3,918
  
Number of shares held, end of period
    
3,918
      
3,918
  
Number of Common Stock B outstanding, end of period
    
9,125
      
9,149