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Common Shares (Tables)
9 Months Ended
Jan. 31, 2020
Stockholders' Equity Note [Abstract]  
Common Shares Information
The following table sets forth common share information.
January 31, 2020April 30, 2019
Common shares authorized300.0  300.0  
Common shares outstanding114.0  113.7  
Treasury shares32.5  32.8