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Significant Accounting Policies - Summary of Distributions Per Share and in Total (Detail) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2018
Oct. 31, 2018
[1]
Jul. 31, 2018
[1]
Apr. 30, 2018
[1]
Jan. 31, 2018
[1]
Oct. 31, 2017
[1]
Oct. 31, 2018
Oct. 31, 2017
Dividends [Abstract]                
Distributions per Share   $ 0.10 $ 0.07 $ 0.04 $ 0.01 $ 0.01 $ 0.22 $ 0.01
Distributions Paid $ 89,964           $ 470,368 $ 16,305
[1] The amount shown for a Share outstanding for quarterly statements may not correlate with year to date amounts due to timing of subscriptions and redemptions in relation to income earned or distributed.