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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) - USD ($)
 9 Months Ended 12 Months Ended
Jul. 31, 2016
Oct. 31, 2015
Temporary Equity Disclosure [Abstract]    
Opening Balance, Shares 3,300,000 1,650,000
Shares issued, Shares 9,700,000 11,400,000
Shares redeemed, Shares (9,900,000) (9,750,000)
Ending Balance, Shares 3,100,000 3,300,000
Opening Balance, Amount $ 357,228,041 $ 203,700,538
Shares issued, Amount 1,050,948,694 1,273,611,058
Shares redeemed, Amount (1,072,721,397) (1,089,370,082)
Adjustment to period Shares due to currency movement and other, Amount 2,409,763 (30,713,473)
Ending Balance, Amount $ 337,865,101 $ 357,228,041