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Sponsor's Fee - Additional Information (Detail) - Sponsor [Member]
9 Months Ended
Jul. 31, 2017
USD ($)
Accrued Professional Fees [Member]  
Related Party Transaction [Line Items]  
Sponsor's fee accrues daily and paid monthly, annual nominal Rate 0.40%
Professional Fees Liability [Member]  
Related Party Transaction [Line Items]  
Legal fees and expenses assumed $ 100,000
Excess amount of assumed audit fees and legal expenses $ 100,000