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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) - USD ($)
 12 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2015
Temporary Equity Disclosure [Abstract]      
Opening Balance, Shares 2,350,000 2,550,000 3,300,000
Shares Issued, Shares 450,000 250,000 1,400,000
Shares Redeemed, Shares (950,000) (450,000) (2,150,000)
Ending Balance, Shares 1,850,000 2,350,000 2,550,000
Opening Balance, Amount $ 178,918,567 $ 182,130,886 $ 290,508,116
Shares Issued, Amount 34,369,885 18,499,561 108,329,725
Shares Redeemed, Amount (72,530,089) (33,314,772) (166,357,064)
Adjustment to period Shares due to currency movement and other, Amount 1,183,464 11,602,892 (50,349,891)
Ending Balance, Amount $ 141,941,827 $ 178,918,567 $ 182,130,886