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Organization - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 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 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 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% |  |  |  |  |  |
Notes payable to members |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 |  | $ 100 |  |  | $ 0 |  |  |
Net realized (gain) loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,355 | $ 568 |  |  |  |  |
Debt securitization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,700 | $ 297,800 | $ 300,700
Common stock shares issued |  |  |  |  |  |  |  |  |  |  |  |  | 2,800,000 | 8,770,000 | 21,638,000 | 13,263,436 |  |  |  |  |
Percentage of public offering price per notes issued |  |  |  |  |  |  | 101.50% |  | 99.40% |  |  |  |  |  |  |  |  |  |  |  |
Current ATM Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Offering Deferred Costs |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 | $ 0 | $ 300 | $ 500 |  |  |  |  |
Common stock shares issued |  |  |  |  |  |  |  |  |  |  |  |  | 2,800,000 | 8,770,000 | 21,638,000 | 13,263,436 |  |  |  |  |
Weighted average price per share of common stock issued |  |  |  |  |  |  |  |  |  |  |  |  | $ 11.31 | $ 11.41 | $ 11.34 | $ 11.39 |  |  |  |  |
Average Price Per Share Of Common Stock Issued |  |  |  |  |  |  |  |  |  |  |  |  | $ 11.31 | $ 11.41 | $ 11.34 | $ 11.39 |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  |  |  |  | $ 31,600 | $ 100,100 | $ 244,800 | $ 150,600 |  |  |  |  |
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% |  |  |  |  |  |
Effective Interest Rate |  |  |  |  |  |  |  |  |  |  |  |  | 4.15% |  | 4.15% |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  | 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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