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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 2,300,000 2,650,000
Shares issued, Shares 250,000 500,000
Shares redeemed, Shares (450,000) (850,000)
Adjustment to period shares due to currency movement and other, Shares 0 0
Ending Balance, Shares 2,100,000 2,300,000
Opening Balance, Amount $ 176,007,716 $ 195,544,021
Shares issued, Amount 19,416,923 37,735,347
Shares redeemed, Amount (34,949,781) (64,137,640)
Adjustment to period shares due to currency movement and other, Amount 1,152,000 6,865,988
Ending Balance, Amount $ 161,626,858 $ 176,007,716