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Redeemable Capital Shares (Details) (USD $)
 6 Months Ended 12 Months Ended
Apr. 30, 2013
Oct. 31, 2012
Schedule of activity in redeemable capital Shares    
Opening balance, Shares 2,050,000 1,850,000
Opening balance, Amount $ 263,827,113 $ 257,096,734
Shares issued, Shares 3,700,000 12,850,000
Shares issued, Amount 480,729,581 1,652,638,909
Shares redeemed, Shares (3,650,000) (12,650,000)
Shares redeemed, Amount (474,264,532) (1,626,832,329)
Adjustment to period Shares due to currency movement and other, Shares      
Adjustment to period Shares due to currency movement and other, Amount 4,138,533 (19,076,201)
Ending balance, Shares 2,100,000 2,050,000
Ending balance, Amount $ 274,430,695 $ 263,827,113