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Redeemable Capital Shares (Details) (USD $)
 12 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2010
Activity in redeemable capital Shares      
Redeemable capital shares, shares outstanding Opening balance 6,350,000 5,850,000 6,000,000
Redeemable capital Shares Value Opening balance $ 635,831,194 $ 571,687,445 $ 555,522,004
Redeemable Capital Shares issued, Shares 150,000 7,700,000 2,600,000
Redeemable Capital Shares issued, Value 14,846,422 775,887,155 249,212,202
Redeemable Capital Shares Redeemed, Shares (1,550,000) (7,200,000) (2,750,000)
Redeemable Capital Shares Redeemed, Value (153,417,420) (725,504,395) (263,517,597)
Adjustment to period Shares due to currency movement and other, Shares         
Adjustment to period Shares due to currency movement and other, Value (4,750,127) 13,760,989 30,470,836
Redeemable capital shares, shares outstanding Ending balance 4,950,000 6,350,000 5,850,000
Redeemable capital Shares Value Ending balance $ 492,510,069 $ 635,831,194 $ 571,687,445