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Redeemable Capital Shares (Details) (USD $)
 12 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2010
Schedule of activity in redeemable capital Shares      
Opening balance, Shares 1,850,000 2,800,000 3,900,000
Opening balance, Amount $ 257,096,734 $ 387,741,044 $ 574,795,922
Shares issued, Shares 12,850,000 25,450,000 18,800,000
Shares redeemed, Shares (12,650,000) (26,400,000) (19,900,000)
Shares issued, Amount 1,652,638,909 3,532,613,866 2,527,532,186
Shares redeemed, Amount (1,626,832,329) (3,664,496,177) (2,675,163,019)
Adjustment to period Shares due to currency movement and other, Amount (19,076,201) 1,238,001 (39,424,045)
Ending balance, Shares 2,050,000 1,850,000 2,800,000
Ending balance, Amount $ 263,827,113 $ 257,096,734 $ 387,741,044