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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 1,300,000 1,200,000
Shares issued, Shares 450,000 3,300,000
Shares redeemed, Shares (150,000) (3,200,000)
Adjustment to period Shares due to currency movement and other, Shares 0 0
Ending Balance, Shares 1,600,000 1,300,000
Opening Balance, Amount $ 109,883,188 $ 110,230,193
Shares issued, Amount 38,469,313 283,768,433
Shares redeemed, Amount (12,831,367) (275,123,327)
Adjustment to period Shares due to currency movement and other, Amount 5,086,474 (8,992,111)
Ending Balance, Amount $ 140,607,608 $ 109,883,188