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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
Changes In Redeemable Capital Shares [Abstract]    
Opening balance, Shares 1,500,000 2,050,000
Shares issued, Shares 2,300,000 6,800,000
Shares redeemed, Shares (2,450,000) (7,350,000)
Adjustment to period shares due to currency movement and other, Shares      
Ending balance, Shares 1,350,000 [1] 1,500,000
Opening balance, Amount $ 201,725,396 $ 263,827,113
Shares issued, Amount 311,172,251 888,213,089
Shares redeemed, Amount (331,410,084) (960,031,281)
Adjustment to period Shares due to currency movement and other, Amount 3,320,345 9,716,475
Ending balance, Amount $ 184,807,908 [1] $ 201,725,396
[1] (Unaudited)