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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 1,600,000 1,200,000
Shares issued, Shares 4,550,000 4,900,000
Shares redeemed, Shares (4,600,000) (4,500,000)
Ending Balance, Shares 1,550,000 1,600,000
Opening Balance, Amount $ 128,567,957 $ 104,213,390
Shares issued, Amount 389,839,219 395,772,647
Shares redeemed, Amount (393,911,854) (363,514,395)
Adjustment to period Shares due to currency movement and other, Amount 21,682,550 (7,903,685)
Ending Balance, Amount $ 146,177,872 $ 128,567,957