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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) - USD ($)
 6 Months Ended 12 Months Ended
Apr. 30, 2018
Oct. 31, 2017
Temporary Equity Disclosure [Abstract]    
Opening Balance, Shares 1,300,000 1,200,000
Shares issued, Shares 1,050,000 3,300,000
Shares redeemed, Shares (450,000) (3,200,000)
Adjustment to period Shares due to currency movement and other, Shares 0 0
Ending Balance, Shares 1,900,000 1,300,000
Opening Balance, Amount $ 109,883,188 $ 110,230,193
Shares issued, Amount 91,757,297 283,768,433
Shares redeemed, Amount (39,323,229) (275,123,327)
Adjustment to period Shares due to currency movement and other, Amount 4,038,805 (8,992,111)
Ending Balance, Amount $ 166,356,061 $ 109,883,188