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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) - USD ($)
 12 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2016
Temporary Equity Disclosure [Abstract]      
Opening Balance, Shares 1,300,000 1,200,000 1,600,000
Shares issued, Shares 1,300,000 3,300,000 5,050,000
Shares redeemed, Shares (1,100,000) (3,200,000) (5,450,000)
Adjustment to period Shares due to currency movement 0 0 0
Ending Balance, Shares 1,500,000 1,300,000 1,200,000
Opening Balance, Amount $ 109,883,188 $ 110,230,193 $ 128,567,957
Shares issued, Amount 112,839,783 283,768,433 443,142,449
Shares redeemed, Amount (95,396,862) (275,123,327) (477,929,067)
Adjustment to period Shares due to currency movement (305,520) (8,992,111) 16,448,854
Ending Balance, Amount $ 127,020,589 $ 109,883,188 $ 110,230,193