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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) - USD ($)
 9 Months Ended 12 Months Ended
Jul. 31, 2017
Oct. 31, 2016
Temporary Equity Disclosure [Abstract]    
Opening Balance, Shares 2,350,000 2,550,000
Shares issued, Shares 250,000 250,000
Shares redeemed, Shares (400,000) (450,000)
Ending Balance, Shares 2,200,000 2,350,000
Opening Balance, Amount $ 178,918,567 $ 182,130,886
Shares issued, Amount 18,876,552 18,499,561
Shares redeemed, Amount (30,191,441) (33,314,772)
Adjustment to period Shares due to currency movement and other, Amount 8,172,111 11,602,892
Ending Balance, Amount $ 175,775,789 $ 178,918,567