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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) - USD ($)
 9 Months Ended 12 Months Ended
Jul. 31, 2017
Oct. 31, 2016
Temporary Equity Disclosure [Abstract]    
Opening Balance, Shares 1,200,000 1,600,000
Shares Issued, Shares 3,200,000 5,050,000
Shares Redeemed, Shares (3,100,000) (5,450,000)
Adjustment to period Shares due to currency movement and other, Shares 0 0
Ending Balance, Shares 1,300,000 1,200,000
Opening Balance, Amount $ 110,230,193 $ 128,567,957
Shares Issued, Amount 274,407,976 443,142,449
Shares Redeemed, Amount (265,790,488) (477,929,067)
Adjustment to period Shares due to currency movement and other, Amount (5,703,942) 16,448,854
Ending Balance, Amount $ 113,143,739 $ 110,230,193