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Investments - Summary of PSSL's Portfolio at Fair Value (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Mar. 31, 2023 USD ($) Portfolio	Sep. 30, 2022 USD ($) Portfolio
Schedule Of Investments [Line Items]
Fair Value	$ 1,164,032	$ 1,164,254
PennantPark Senior Secured Loan Fund I LLC
Schedule Of Investments [Line Items]
Fair Value	$ 771,413	$ 754,722
Weighted average cost yield on income producing investments	11.40%	9.60%
Number of portfolio companies in PSSL | Portfolio	103	95
Largest portfolio company investment	$ 17,890	$ 19,250
Total of five largest portfolio company investments	$ 84,124	$ 86,872

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Total investment owned at fair value.

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Weighted average yield of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1403
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Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
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