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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1

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-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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Organization - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands								1 Months Ended			12 Months Ended			156 Months Ended
	Dec. 15, 2023	Aug. 11, 2023	Mar. 27, 2023	Dec. 15, 2022	Dec. 15, 2021	Aug. 20, 2021	Dec. 15, 2020	Apr. 30, 2021	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2023	Oct. 31, 2021	Mar. 31, 2021	Nov. 30, 2017
Debt Instrument [Line Items]
Percentage of managed assets invested											80.00%
2035 Asset-backed debt net (par-$246,000)											$ 76,200	$ 97,000		$ 76,200
Deferred Offering Costs											1,000			$ 1,000
Net realized (gain) loss											$ (15,892)	$ (11,106)	$ (12,796)
Common stock, par value											$ 0.001	$ 0.001		$ 0.001
Common stock shares issued											13,389,064	6,464,910	108,654
Common stock issued issued											$ 148,408	$ 81,936	$ 1,403
At The Market Offering
Debt Instrument [Line Items]
Proceeds from Issuance of Common Stock											$ 100,200	$ 31,900
Common stock shares issued											9,089,064	2,464,910		11,662,628
Weighted average price per share of common stock issued											$ 11.03	$ 13.12		$ 11.44
Proceeds from issuance of common stock gross														$ 133,500
Proceeds from issuance of common stock											$ 100,200	$ 31,900
Common stock issued issued											154,100	41,300
Legal and other offering costs											$ 500	$ 100		500
Equity Distribution Agreements
Debt Instrument [Line Items]
Proceeds from Issuance of Common Stock		$ 250,000	$ 100,000
Aggregate offering price						$ 75,000
Proceeds from issuance of common stock		$ 250,000	$ 100,000
2026 Notes Payable
Debt Instrument [Line Items]
2035 Asset-backed debt net (par-$246,000)															$ 85,000	$ 100,000
Percentage of public offering price per notes issued															101.50%	99.40%
Debt instrument, interest rate											4.25%
Debt instrument, maturity date											Apr. 01, 2026
Debt instrument, periodic payment											semi-annually
PennantPark-TSO Senior Loan Fund, LP
Debt Instrument [Line Items]
Sale of investments to wholly owned subsidiary								$ 81,400
Sale of investments to wholly owned subsidiary in cash								69,500
Sale of investments to wholly owned subsidiary in equity interest								$ 11,900
Percentage of outstanding class A units								23.08%					23.08%
Net realized (gain) loss								$ 400
Capital commitment													$ 15,300
Voting interest in general partnership													4.99%
2023 Notes
Debt Instrument [Line Items]
2035 Asset-backed debt net (par-$246,000)																	$ 138,600
Debt instrument, interest rate									4.30%
Debt instrument, periodic payment											four annual installments
Percentage of original principal amount payable				15.00%	15.00%		15.00%
2023 Notes \| Scenario Forecast
Debt Instrument [Line Items]
Percentage of original principal amount payable	55.00%
SOFR
Debt Instrument [Line Items]
Credit facility basis points											2.36%
2031 Asset-Backed Debt
Debt Instrument [Line Items]
Percentage of preferred shares of securitization issuer										100.00%
2031 Asset-Backed Debt \| Class D Secured Deferrable Floating Rate Notes
Debt Instrument [Line Items]
Percentage of notes issued by securitization issuer										100.00%
Maximum \| SOFR
Debt Instrument [Line Items]
Maximum borrowing capacity											$ 386,000			$ 386,000
First Lien Secured Debt \| Minimum
Debt Instrument [Line Items]
Percentage of overall portfolio											65.00%
Second Lien Secured Debt \| Maximum
Debt Instrument [Line Items]
Percentage of overall portfolio											35.00%