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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) - USD ($)
 12 Months Ended
Oct. 31, 2016
Oct. 31, 2015
Dec. 31, 2014
Oct. 31, 2014
Temporary Equity Disclosure [Abstract]        
Opening balance, Shares 1,600,000 1,200,000   1,450,000
Shares Issued, Shares 5,050,000 4,900,000   2,450,000
Shares Redeemed, Shares (5,450,000) (4,500,000)   (2,700,000)
Adjustment to period Shares due to currency movement and other, Shares 0 0   0
Ending balance, Shares 1,200,000 1,600,000   1,200,000
Opening balance, Amount $ 128,567,957 $ 104,213,390 $ 144,463,850  
Shares Issued, Amount 443,142,449 395,772,647 231,663,439  
Shares Redeemed, Amount (477,929,067) (363,514,395) (255,292,426)  
Adjustment to period Shares due to currency movement and other, Amount 16,448,854 (7,903,685) (16,621,473)  
Ending balance, Amount $ 110,230,193 $ 128,567,957 $ 104,213,390 $ 104,213,390