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Redeemable Capital Shares (Details) (USD $)
 6 Months Ended 12 Months Ended
Apr. 30, 2013
Oct. 31, 2012
Schedule for redeemable capital shares activity    
Opening balance, Shares 4,950,000 6,350,000
Opening balance, Amount $ 492,510,069 $ 635,831,194
Shares issued, Shares 200,000 150,000
Shares issued, Amount 19,783,211 14,846,422
Shares redeemed, Shares (650,000) (1,550,000)
Shares redeemed, Amount (64,297,605) (153,417,420)
Adjustment to period shares due to currency movement and other, Shares      
Adjustment to period shares due to currency movement and other, Amount (3,064,574) (4,750,127)
Ending balance, Shares 4,500,000 4,950,000
Ending balance, Amount $ 444,931,101 $ 492,510,069