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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) - USD ($)
 12 Months Ended
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2014
Temporary Equity Disclosure [Abstract]      
Opening balance, Shares 2,550,000 3,300,000 4,500,000
Shares issued, Shares 250,000 1,400,000 1,000,000
Shares redeemed, Shares (450,000) (2,150,000) (2,200,000)
Ending balance, Shares 2,350,000 2,550,000 3,300,000
Opening balance, Amount $ 182,130,886 $ 290,508,116 $ 426,725,846
Shares issued, Amount 18,499,561 108,329,725 91,514,294
Shares redeemed, Amount (33,314,772) (166,357,064) (201,328,373)
Adjustment to period Shares due to currency movement and other, Amount 11,602,892 (50,349,891) (26,403,651)
Ending balance, Amount $ 178,918,567 $ 182,130,886 $ 290,508,116