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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]	Jul. 31, 2017	[1]	Apr. 30, 2017	[1]	Jan. 31, 2017	[1]	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Dividends [Abstract]
Distributions per Share		$ 0.21		$ 0.20		$ 0.17		$ 0.13		$ 0.18		$ 0.17		$ 0.17		$ 0.15		$ 0.72	$ 0.66	$ 0.81
Distributions paid	$ 106,726																	$ 1,210,590	$ 1,460,231	$ 1,972,470
[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.

X

- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- References

No definition available.

+ Details

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- Definition

Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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