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Organization - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands						1 Months Ended							3 Months Ended		6 Months Ended
	Jul. 17, 2024	Dec. 15, 2023	Dec. 15, 2022	Dec. 15, 2021	Dec. 15, 2020	Jul. 31, 2024	Oct. 31, 2021	Apr. 30, 2021	Mar. 31, 2021	Mar. 31, 2020	Sep. 30, 2019	Nov. 30, 2017	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024	Feb. 28, 2025	Sep. 30, 2024	May 31, 2024	Apr. 30, 2023	Jan. 31, 2021
Debt Instrument [Line Items]
Percentage of managed assets invested															80.00%
Net realized (gain) loss															$ 23,197	$ 921
Common stock, par value													$ 0.001		$ 0.001			$ 0.001
Debt securitization																			$ 300,700	$ 297,800	$ 300,700
Common stock shares issued													11,562,000	4,493,436	18,838,000	4,493,436
Common stock issued issued													$ 131,103	$ 51,391	$ 213,811	$ 51,391
Percentage of public offering price per notes issued							101.50%		99.40%
Current ATM Program
Debt Instrument [Line Items]
Deferred Offering Costs													$ 200	$ 600	$ 200	$ 600
Common stock shares issued													11,562,000	4,493,436	18,838,000	4,493,436
Weighted average price per share of common stock issued													$ 11.34	$ 11.35	$ 11.35	$ 11.35
Average Price Per Share Of Common Stock Issued													$ 11.34	$ 11.35	$ 11.35
Proceeds from issuance of common stock gross													$ 131,000	$ 51,000	$ 213,200	$ 51,000
Proceeds from issuance of common stock													131,000	$ 51,000	$ 213,200
Legal and other offering costs						$ 500,000
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
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%
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		$ 15,300
Voting interest in general partnership															4.99%
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%
2023 Notes
Debt Instrument [Line Items]
Notes payable to members												$ 138,600
Debt instrument, interest rate										4.30%
Debt instrument, periodic payment															four annual installments
Percentage of original principal amount payable		55.00%	15.00%	15.00%	15.00%
Notes issued												$ 138,600
Interest payment terms															Interest on the 2023 Notes was payable semi-annually in arrears on June 15 and December 15 of each year, commencing June 15, 2018.
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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