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Organization - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended							3 Months Ended		12 Months Ended
	Jul. 17, 2024	Nov. 30, 2025	Oct. 31, 2025	Jul. 31, 2024	Oct. 31, 2021	Apr. 30, 2021	Mar. 31, 2021	Sep. 30, 2019	Dec. 31, 2025	Dec. 31, 2024	Sep. 30, 2025	Oct. 29, 2025	Feb. 28, 2025	May 31, 2024	Apr. 30, 2023	Jan. 31, 2021
Debt Instrument [Line Items]
Percentage of managed assets invested									80.00%
Notes payable to members									$ 0		$ 700
Net realized (gain) loss									1,457	$ 26,674
Company acquired portfolio									$ 250,000
Debt securitization												$ 21,000		$ 300,700	$ 297,800	$ 300,700
Sale of debt securitization			$ 21,000
Common stock shares issued									0	7,276,000
Public offering									$ 0	$ 82,708
Percentage of public offering price per notes issued					101.50%		99.40%
Current ATM Program
Debt Instrument [Line Items]
Common stock shares issued									0	7,276,000
Weighted average price per share of common stock issued										$ 11.3
Average Price Per Share Of Common Stock Issued										$ 11.3
Proceeds from issuance of common stock										$ 82,200
Public offering									$ 192,200		$ 192,200
Legal and other offering costs				$ 500,000					$ 0	$ 100
At The Market Offerings Terminated				250,000
Equity Distribution Agreements | Current ATM Program
Debt Instrument [Line Items]
Aggregate offering price	$ 500,000
Two Thousand Thirty One Asset Backed Debt [Member]
Debt Instrument [Line Items]
Debt securitization				351,000
Class D Notes
Debt Instrument [Line Items]
Sale of notes		$ 28,500
2026 Notes Payable
Debt Instrument [Line Items]
Notes payable to members					$ 85,000		$ 100,000
Percentage of public offering price per notes issued					101.50%		99.40%
Debt instrument, interest rate									4.25%
Effective Interest Rate									4.15%
Debt instrument, maturity date									Apr. 01, 2026
Debt instrument, periodic payment									semiannually
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%
Net realized (gain) loss						$ 400
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%
2031 Asset-Backed Debt
Debt Instrument [Line Items]
Debt securitization retained amount				$ 85,000
Percentage of preferred shares of securitization issuer								100.00%
2031 Asset-Backed Debt | Secured Overnight Financing Rate [Member]
Debt Instrument [Line Items]
Percentage points added to reference rate									1.80%
2031 Asset-Backed Debt | Class B-2 Senior Secured Fixed Rate Notes due 2031
Debt Instrument [Line Items]
Debt instrument, interest rate								4.30%
Debt instrument								$ 16,000
2031 Asset-Backed Debt | Class A1 Senior Secured Floating Rate Loans [Member]
Debt Instrument [Line Items]
Debt instrument								$ 78,500
Reference rate description									three-month SOFR plus 1.8%
2031 Asset-Backed Debt | Class D Secured Deferrable Floating Rate Notes
Debt Instrument [Line Items]
Percentage of notes issued by securitization issuer								100.00%
2037 Debt Securitization [Member]
Debt Instrument [Line Items]
Debt securitization retained amount													$ 85,100
2037 Debt Securitization [Member] | Class D Notes
Debt Instrument [Line Items]
Debt securitization retained amount													28,500
2037 Asset-Backed Debt
Debt Instrument [Line Items]
Debt securitization													$ 474,600

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