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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 2,500,000 3,300,000
Shares Issued, Shares 4,400,000 11,050,000
Shares Redeemed, Shares (4,000,000) (11,850,000)
Ending Balance, Shares 2,900,000 2,500,000
Opening Balance, Amount $ 266,551,806 $ 357,228,041
Shares Issued, Amount 455,404,950 1,198,371,197
Shares Redeemed, Amount (414,238,526) (1,285,096,408)
Adjustment to period Shares due to currency movement and other, Amount (1,795,230) (3,951,024)
Ending Balance, Amount $ 305,923,000 $ 266,551,806