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Significant Accounting Policies - Additional Information (Detail)
6 Months Ended
Apr. 30, 2018
USD ($)
$ / shares
Accounting Policies [Abstract]  
Provision for federal income taxes | $ $ 0
Minimum days required to stay for tax liability 183 days
Dividend payable, amount per share | $ / shares $ 0.01538
Dividend payable, date to be paid May 08, 2018