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Redeemable Capital Shares (Details) (USD $)
 3 Months Ended 12 Months Ended
Jan. 31, 2013
Oct. 31, 2012
Activity in redeemable capital Shares    
Redeemable capital shares, shares outstanding Opening balance 4,950,000 6,350,000
Redeemable capital Shares Value Opening balance $ 492,510,069 $ 635,831,194
Redeemable Capital Shares issued, Shares 200,000 150,000
Redeemable Capital Shares issued, Value 20,016,166 14,846,422
Redeemable Capital Shares Redeemed, Shares (250,000) (1,550,000)
Redeemable Capital Shares Redeemed, Value (25,020,438) (153,417,420)
Adjustment to period Shares due to currency movement and other, Shares      
Adjustment to period Shares due to currency movement and other, Value 350,299 (4,750,127)
Redeemable capital shares, shares outstanding Ending balance 4,900,000 4,950,000
Redeemable capital Shares Value Ending balance $ 487,856,096 $ 492,510,069