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Organization - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 15, 2023 | Aug. 11, 2023 | Mar. 27, 2023 | Dec. 15, 2022 | Dec. 15, 2021 | Dec. 15, 2020 | Oct. 31, 2021 | Apr. 30, 2021 | Mar. 31, 2021 | Mar. 31, 2020 | Sep. 30, 2019 | Nov. 30, 2017 | Dec. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2023
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of managed assets invested |  |  |  |  |  |  |  |  |  |  |  |  | 80.00% |  |
Net realized (gain) loss |  |  |  |  |  |  |  |  |  |  |  |  | $ (3,089) | $ 63 |
Common stock, par value |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.001 |  | $ 0.001
Common stock shares issued |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 86,177 |
Common stock issued issued |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 995 |
Percentage of public offering price per notes issued |  |  |  |  |  |  | 101.50% |  | 99.40% |  |  |  |  |  |
Current ATM Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock shares issued |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Equity Distribution Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate offering price |  | $ 250,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Distribution Agreements | Current ATM Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate offering price |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |

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