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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 2,650,000 2,850,000
Shares Issued, Shares 400,000 350,000
Shares Redeemed, Shares (650,000) (550,000)
Adjustment to period shares due to currency movement and other, Shares 0 0
Ending Balance, Shares 2,400,000 2,650,000
Opening Balance, Amount $ 195,544,021 $ 216,269,477
Shares Issued, Amount 29,746,940 26,133,576
Shares Redeemed, Amount (48,329,062) (41,053,575)
Adjustment to period shares due to currency movement and other, Amount 12,364,278 (5,805,457)
Ending Balance, Amount $ 189,326,177 $ 195,544,021