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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Jan. 31, 2018
Oct. 31, 2017
Temporary Equity Disclosure [Abstract]    
Opening Balance, Shares 1,850,000 2,350,000
Shares issued, Shares 50,000 450,000
Shares redeemed, Shares (250,000) (950,000)
Ending Balance, Shares 1,650,000 1,850,000
Opening Balance, Amount $ 141,941,827 $ 178,918,567
Shares issued, Amount 3,872,577 34,369,885
Shares redeemed, Amount (19,361,957) (72,530,089)
Adjustment to period Shares due to currency movement and other, Amount 7,264,995 1,183,464
Ending Balance, Amount $ 133,717,442 $ 141,941,827