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Significant Accounting Policies - Additional Information (Detail)
9 Months Ended
Jul. 31, 2018
USD ($)
$ / shares
Accounting Policies [Abstract]  
Provision for federal income taxes | $ $ 0
Minimum days required to stay for tax liability 183 days
Dividend ex-dividend, income distribution per share | $ / shares $ 0.07909
Dividend payment date Aug. 08, 2018