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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
Changes In Redeemable Capital Shares [Abstract]    
Opening balance, Shares 1,500,000 2,050,000
Shares issued, Shares 3,850,000 6,800,000
Shares redeemed, Shares (3,750,000) (7,350,000)
Adjustment to period Shares due to currency movement and other, Shares      
Ending balance, Shares 1,600,000 [1] 1,500,000
Opening balance, Amount $ 201,725,396 $ 263,827,113
Shares issued, Amount 519,698,078 888,213,089
Shares redeemed, Amount (506,176,139) (960,031,281)
Adjustment to period Shares due to currency movement and other, Amount (4,088,175) 9,716,475
Ending balance, Amount $ 211,159,160 [1] $ 201,725,396
[1] (Unaudited)