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Euro Deposits (Details)
 9 Months Ended 12 Months Ended
Jul. 31, 2012
EUR (€)
Oct. 31, 2011
EUR (€)
Jul. 31, 2012
USD ($)
Oct. 31, 2011
USD ($)
Euro Deposits (Textual) [Abstract]        
Euro principal deposits € 1,114,988,481 € 2,535,042,636    
Euro principal redemptions 1,080,140,574 2,629,658,330    
Euro principal withdrawals 337,372 64,021    
Euro principal balance € 218,785,184 € 184,274,649 $ 269,444,859 $ 257,026,161
Interest rate on interest-bearing demand account     0.00%