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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) - USD ($)
 12 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2015
Temporary Equity Disclosure [Abstract]      
Opening Balance, Shares 2,500,000 3,300,000 1,650,000
Shares Issued, Shares 10,300,000 11,050,000 11,400,000
Shares Redeemed, Shares (9,300,000) (11,850,000) (9,750,000)
Ending Balance, Shares 3,500,000 2,500,000 3,300,000
Opening Balance, Amount $ 266,551,806 $ 357,228,041 $ 203,700,538
Shares Issued, Amount 1,108,131,814 1,198,371,197 1,273,611,058
Shares Redeemed, Amount (1,000,949,967) (1,285,096,408) (1,089,370,082)
Adjustment to period Shares due to currency movement and other, Amount 19,641,670 (3,951,024) (30,713,473)
Ending Balance, Amount $ 393,375,323 $ 266,551,806 $ 357,228,041