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Redeemable Capital Shares (Schedule Of Activity In Redeemable Capital Shares) (Details) (USD $)
 3 Months Ended 12 Months Ended
Jan. 31, 2012
Oct. 31, 2011
Redeemable Capital Shares [Abstract]    
Redeemable capital shares, Opening balance, shares 1,850,000 2,800,000
Shares issued, shares 5,550,000 25,450,000
Shares redeemed, shares (5,500,000) (26,400,000)
Adjustment to period Shares due to currency movement and other, shares      
Redeemable capital shares, Ending balance, shares 1,900,000 1,850,000
Redeemable capital shares, Opening balance, value $ 257,096,734 $ 387,741,044
Common stock issued, value 729,729,837 3,532,613,866
Shares redeemed, value (723,129,167) (3,664,496,177)
Adjustment to period Shares due to currency movement and other (16,020,220) 1,238,001
Redeemable capital Shares, Ending balance, value $ 247,677,184 $ 257,096,734