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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 2,500,000 3,300,000
Shares Issued, Shares 7,900,000 11,050,000
Shares Redeemed, Shares (7,650,000) (11,850,000)
Ending Balance, Shares 2,750,000 2,500,000
Opening Balance, Amount $ 266,551,806 $ 357,228,041
Shares Issued, Amount 832,272,473 1,198,371,197
Shares Redeemed, Amount (806,102,970) (1,285,096,408)
Adjustment to period Shares due to currency movement and other, Amount 20,722,146 (3,951,024)
Ending Balance, Amount $ 313,443,455 $ 266,551,806