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Euro Deposits - Additional Information (Detail)
9 Months Ended 12 Months Ended
Jul. 31, 2015
EUR (€)
Oct. 31, 2014
EUR (€)
Jul. 31, 2015
USD ($)
[1]
Jul. 31, 2015
EUR (€)
Oct. 31, 2014
USD ($)
Oct. 31, 2014
EUR (€)
Securities Financing Transaction [Line Items]            
Euro principal deposits € 934,581,677 € 582,440,607        
Euro principal redemptions 850,834,984 567,615,398        
Euro principal withdrawals € 886,803 € 613,581        
Euro deposits, interest bearing     $ 271,249,145 € 245,507,601 $ 216,126,592 € 162,647,711
Redemptions Payable [Member]            
Securities Financing Transaction [Line Items]            
Euro deposits, interest bearing | $         $ 203,781,392  
[1] (Unaudited)