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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Jan. 31, 2016
Oct. 31, 2015
Temporary Equity Disclosure [Abstract]    
Opening Balance, Shares 3,300,000 1,650,000
Shares issued, Shares 6,800,000 11,400,000
Shares redeemed, Shares (7,400,000) (9,750,000)
Ending Balance, Shares 2,700,000 3,300,000
Opening Balance, Amount $ 357,228,041 $ 203,700,538
Shares issued, Amount 721,165,372 1,273,611,058
Shares redeemed, Amount (784,580,695) (1,089,370,082)
Adjustment to period Shares due to currency movement and other, Amount (7,958,902) (30,713,473)
Ending Balance, Amount $ 285,853,816 $ 357,228,041