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Consolidated Balance Sheets (Parenthetical) - shares
Apr. 30, 2018
Apr. 30, 2017
Statement of Financial Position [Abstract]    
Serial preferred shares, no par value, shares authorized (in shares) 6,000,000 6,000,000
Serial preferred shares, no par value, shares outstanding (in shares) 0 0
Common shares, no par value, shares authorized (in shares) 300,000,000 300,000,000
Common shares, no par value, shares outstanding (in shares) 113,572,840 113,439,553
Treasury shares, shares outstanding (in shares) 32,924,890 33,058,177