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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) - USD ($)
 12 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2016
Temporary Equity Disclosure [Abstract]      
Opening Balance, Shares 3,500,000 2,500,000 3,300,000
Shares Issued, Shares 4,700,000 10,300,000 11,050,000
Shares Redeemed, Shares (5,900,000) (9,300,000) (11,850,000)
Ending Balance, Shares 2,300,000 3,500,000 2,500,000
Opening Balance, Amount $ 393,375,323 $ 266,551,806 $ 357,228,041
Shares Issued, Amount 537,010,429 1,108,131,814 1,198,371,197
Shares Redeemed, Amount (674,227,051) (1,000,949,967) (1,285,096,408)
Adjustment to period Shares due to currency movement, Amount (6,766,178) 19,641,670 (3,951,024)
Ending Balance, Amount $ 249,392,523 $ 393,375,323 $ 266,551,806