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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) (USD $)
 9 Months Ended 12 Months Ended
Jul. 31, 2014
Oct. 31, 2013
Equity [Abstract]    
Opening balance, Shares 3,550,000 4,950,000
Shares issued, Shares 400,000 600,000
Shares redeemed, Shares (1,050,000) (2,000,000)
Adjustment to period shares due to currency movement and other, Shares      
Ending balance, Shares 2,900,000 [1] 3,550,000
Opening balance, Amount $ 338,556,957 $ 492,510,069
Shares issued, Amount 36,663,447 58,495,917
Shares redeemed, Amount (96,241,993) (194,992,928)
Adjustment to period shares due to currency movement and other, Amount (14,044,538) (17,456,101)
Ending balance, Amount $ 264,933,873 [1] $ 338,556,957
[1] (Unaudited)