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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) - USD ($)
 6 Months Ended 12 Months Ended
Apr. 30, 2017
Oct. 31, 2016
Temporary Equity Disclosure [Abstract]    
Opening Balance, Shares 2,350,000 2,550,000
Shares issued, Shares 200,000 250,000
Shares redeemed, Shares (300,000) (450,000)
Ending Balance, Shares 2,250,000 2,350,000
Opening Balance, Amount $ 178,918,567 $ 182,130,886
Shares issued, Amount 15,051,167 18,499,561
Shares redeemed, Amount (22,566,422) (33,314,772)
Adjustment to period Shares due to currency movement and other, Amount (3,015,224) 11,602,892
Ending Balance, Amount $ 168,388,088 $ 178,918,567