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Consolidated Balance Sheets (Parenthetical) - $ / shares
Oct. 31, 2018
Oct. 31, 2017
Statement Of Financial Position [Abstract]    
Common stock, par value $ 0.001 $ 0.001
Common stock, authorized shares 605,000,000 605,000,000
Common stock, shares issued 62,683,808 64,145,945
Common stock, shares outstanding 62,683,808 64,145,945