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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) - USD ($)
 2 Months Ended 12 Months Ended
Dec. 31, 2018
Oct. 31, 2018
Oct. 31, 2017
Temporary Equity Disclosure [Abstract]      
Opening Balance, Shares 1,500,000 1,300,000 1,200,000
Shares issued, Shares 500,000 1,300,000 3,300,000
Shares redeemed, Shares   (1,100,000) (3,200,000)
Adjustment to period Shares due to currency movement 0 0 0
Ending Balance, Shares 2,000,000 1,500,000 1,300,000
Opening Balance, Amount $ 127,020,589 $ 109,883,188 $ 110,230,193
Shares issued, Amount 42,358,199 112,839,783 283,768,433
Shares redeemed, Amount   (95,396,862) (275,123,327)
Adjustment to period Shares due to currency movement 4,683,376 (305,520) (8,992,111)
Ending Balance, Amount $ 174,062,164 $ 127,020,589 $ 109,883,188