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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 1,850,000 2,350,000 2,550,000
Shares Issued, Shares 250,000 450,000 250,000
Shares Redeemed, Shares (400,000) (950,000) (450,000)
Ending Balance, Shares 1,700,000 1,850,000 2,350,000
Opening Balance, Amount $ 141,941,827 $ 178,918,567 $ 182,130,886
Shares Issued, Amount 18,880,911 34,369,885 18,499,561
Shares Redeemed, Amount (30,200,732) (72,530,089) (33,314,772)
Adjustment to period Shares due to currency movement (10,027,576) 1,183,464 11,602,892
Ending Balance, Amount $ 120,594,430 $ 141,941,827 $ 178,918,567