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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) - USD ($)
 9 Months Ended 12 Months Ended
Jul. 31, 2018
Oct. 31, 2017
Temporary Equity Disclosure [Abstract]    
Opening Balance, Shares 1,850,000 2,350,000
Shares issued, Shares 200,000 450,000
Shares redeemed, Shares (300,000) (950,000)
Ending Balance, Shares 1,750,000 1,850,000
Opening Balance, Amount $ 141,941,827 $ 178,918,567
Shares issued, Amount 15,330,483 34,369,885
Shares redeemed, Amount (22,987,378) (72,530,089)
Adjustment to period Shares due to currency movement and other, Amount (4,051,282) 1,183,464
Ending Balance, Amount $ 130,233,650 $ 141,941,827