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Sponsor's Fee - Additional Information (Detail)
 12 Months Ended
Oct. 31, 2015
USD ($)
Component Of Other Income And Expense [Line Items]  
Sponsor's fee accrues daily and paid monthly, annual nominal rate 0.40%
Maximum [Member]  
Component Of Other Income And Expense [Line Items]  
Legal fees and expenses assumed sponsor $ 100,000
Minimum [Member]  
Component Of Other Income And Expense [Line Items]  
Legal fees and expenses not assumed by sponsor $ 100,000