XML 19 R6.htm IDEA: XBRL DOCUMENT v3.22.1
Consolidated Balance Sheets (Parenthetical) - shares
Apr. 30, 2022
Apr. 30, 2021
Statement of Financial Position [Abstract]    
Serial preferred shares, no par value, shares authorized (in shares) 6,000,000 6,000,000
Serial preferred shares outstanding 0 0
Common shares authorized 300,000,000 300,000,000
Common shares outstanding 106,458,317 108,339,057
Treasury shares 40,039,413 38,158,673