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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) - USD ($)
 9 Months Ended 12 Months Ended
Jul. 31, 2015
Oct. 31, 2014
Equity [Abstract]    
Opening Balance, Shares 2,850,000 3,550,000
Shares issued, Shares 1,250,000 400,000
Shares redeemed, Shares (1,250,000) (1,100,000)
Adjustment to period shares due to currency movement and other, Shares 0 0
Ending Balance, Shares 2,850,000 [1] 2,850,000
Opening Balance, Amount $ 251,414,970 $ 338,556,957
Shares issued, Amount 101,873,544 36,495,266
Shares redeemed, Amount (101,885,222) (100,362,128)
Adjustment to period shares due to currency movement and other, Amount (33,686,109) (23,275,125)
Ending Balance, Amount $ 217,717,183 [1] $ 251,414,970
[1] (Unaudited)