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Redeemable Capital Shares (Details) (USD $)
 9 Months Ended 12 Months Ended
Jul. 31, 2012
Oct. 31, 2011
Activity in redeemable capital Shares    
Redeemable capital shares, shares outstanding Opening balance 6,350,000 5,850,000
Redeemable capital Shares Value Opening balance $ 635,831,194 $ 571,687,445
Redeemable Capital Shares issued, Shares 50,000 7,700,000
Redeemable Capital Shares issued, Value 4,917,875 775,887,155
Redeemable Capital Shares Redeemed, Shares (1,200,000) (7,200,000)
Redeemable Capital Shares Redeemed, Value (118,035,488) (725,504,395)
Adjustment to period Shares due to currency movement and other, Shares      
Adjustment to period Shares due to currency movement and other, Value (6,772,756) 13,760,989
Redeemable capital shares, shares outstanding Ending balance 5,200,000 6,350,000
Redeemable capital Shares Value Ending balance $ 515,940,825 $ 635,831,194