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Redeemable Capital Shares - Schedule for Redeemable Capital Shares Activity (Detail) (USD $)
 6 Months Ended 12 Months Ended
Apr. 30, 2014
Oct. 31, 2013
Equity [Abstract]    
Opening balance, Shares 3,550,000 4,950,000
Shares issued, Shares 300,000 600,000
Shares redeemed, Shares (850,000) (2,000,000)
Adjustment to period shares due to currency movement and other, Shares      
Ending balance, Shares 3,000,000 [1] 3,550,000
Opening balance, Amount $ 338,556,957 $ 492,510,069
Shares issued, Amount 27,459,850 58,495,917
Shares redeemed, Amount (77,802,540) (194,992,928)
Adjustment to period shares due to currency movement and other, Amount (16,344,549) (17,456,101)
Ending balance, Amount $ 271,869,718 [1] $ 338,556,957
[1] (Unaudited)