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Common Shares (Tables)
3 Months Ended
Jul. 31, 2019
Stockholders' Equity Note [Abstract]  
Common Shares Information
The following table sets forth common share information.
 
July 31, 2019
 
April 30, 2019
Common shares authorized
300.0

 
300.0

Common shares outstanding
114.0

 
113.7

Treasury shares
32.5

 
32.8