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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 2,850,000 2,850,000 3,550,000
Shares Issued, Shares 350,000 1,600,000 400,000
Shares Redeemed, Shares (550,000) (1,600,000) (1,100,000)
Adjustment to period shares due to currency movement and other, Shares 0 0 0
Ending balance, Shares 2,650,000 2,850,000 2,850,000
Opening balance, Amount $ 216,269,477 $ 251,414,970 $ 338,556,957
Shares Issued, Amount 26,133,576 127,858,942 36,495,266
Shares Redeemed, Amount (41,053,575) (127,864,231) (100,362,128)
Adjustment to period shares due to currency movement and other, Amount (5,805,457) (35,140,204) (23,275,125)
Ending balance, Amount $ 195,544,021 $ 216,269,477 $ 251,414,970