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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 1,600,000 1,200,000
Shares issued, Shares 3,650,000 4,900,000
Shares redeemed, Shares (1,550,000) (4,500,000)
Ending Balance, Shares 3,700,000 1,600,000
Opening Balance, Amount $ 128,567,957 $ 104,213,390
Shares issued, Amount 292,616,395 395,772,647
Shares redeemed, Amount (124,251,919) (363,514,395)
Adjustment to period Shares due to currency movement and other, Amount (874,630) (7,903,685)
Ending Balance, Amount $ 296,057,803 $ 128,567,957