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Significant Accounting Policies - Additional Information (Detail) (USD $)
3 Months Ended
Jan. 31, 2015
Accounting Policies [Abstract]  
Provision for federal income taxes $ 0us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Minimum days required to stay for tax liability 183 days
Dividend ex-dividend, income distribution per share $ 0.00829us-gaap_DividendsPayableAmountPerShare
Dividend payment date Feb. 09, 2015