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Organization - Additional Information (Details) - USD ($) |  |  |  |  | 1 Months Ended | 12 Months Ended | 156 Months Ended | 168 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 15, 2023 | Dec. 15, 2022 | Dec. 15, 2021 | Dec. 15, 2020 | Jul. 31, 2024 | Apr. 30, 2021 | Mar. 31, 2020 | Sep. 30, 2019 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2023 | Sep. 30, 2024 | May 31, 2024 | Apr. 30, 2023 | Oct. 31, 2021 | Mar. 31, 2021 | Jan. 31, 2021 | Nov. 30, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of managed assets invested |  |  |  |  |  |  |  |  | 80.00% |  |  |  |  |  |  |  |  |  |  |
Credit Facility payable |  |  |  |  |  |  |  |  | $ 443,880,000 | $ 9,400,000 |  |  | $ 9,400,000 | $ 443,880,000 |  |  |  |  |  |
Deferred Offering Costs |  |  |  |  |  |  |  |  |  | 1,200,000 |  |  | $ 1,200,000 |  |  |  |  |  |  |
Net realized (gain) loss |  |  |  |  |  |  |  |  | $ 222,000 | $ (15,892,000) | $ (11,106,000) |  |  |  |  |  |  |  |  |
Common stock shares issued |  |  |  |  |  |  |  |  | 18,845,194 | 13,389,064 | 6,464,910 |  |  |  |  |  |  |  |  |
Debt securitization |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,700,000 | $ 297,800,000 |  |  | $ 300,700,000 |
Retained debt securitization |  |  |  |  | $ 85,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued issued |  |  |  |  |  |  |  |  | $ 213,910,000 | $ 148,408,000 | $ 81,936,000 |  |  |  |  |  |  |  |  |
At The Market Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ATM Program terminated |  |  |  |  | 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock |  |  |  |  |  |  |  |  | $ 213,300,000 | $ 100,200,000 |  |  |  | $ 312,500 |  |  |  |  |  |
Common stock shares issued |  |  |  |  |  |  |  |  | 1,884,519 | 9,089,064 |  |  | 27,848,081 |  |  |  |  |  |  |
Weighted average price per share of common stock issued |  |  |  |  |  |  |  |  | $ 11.35 | $ 11.03 |  |  |  | $ 11.22 |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  | $ 213,300,000 | $ 100,200,000 |  |  |  | $ 312,500 |  |  |  |  |  |
Common stock issued issued |  |  |  |  |  |  |  |  | 437,300,000 | 154,100,000 |  |  |  |  |  |  |  |  |  |
Legal and other offering costs |  |  |  |  | $ 500,000,000 |  |  |  | $ 800,000 | $ 500,000 |  |  | $ 500,000 | 800,000 |  |  |  |  |  |
2026 Notes Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2035 Asset-backed debt net (par-$246,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 85,000,000 | $ 100,000,000 |  |
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 |  |  |  |  |  | $ 81,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of investments to wholly owned subsidiary in cash |  |  |  |  |  | 69,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of investments to wholly owned subsidiary in equity interest |  |  |  |  |  | $ 11,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of outstanding class A units |  |  |  |  |  | 23.08% |  |  |  |  |  | 23.08% |  |  |  |  |  |  |  |
Net realized (gain) loss |  |  |  |  |  | $ 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital commitment |  |  |  |  |  |  |  |  |  |  |  | $ 15,300,000 |  |  |  |  |  |  |  |
Voting interest in general partnership |  |  |  |  |  |  |  |  |  |  |  | 4.99% |  |  |  |  |  |  |  |
2023 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2035 Asset-backed debt net (par-$246,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 138,600,000
Debt instrument, interest rate |  |  |  |  |  |  | 4.30% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, periodic payment |  |  |  |  |  |  |  |  | four annual installments | four annual installments |  |  |  |  |  |  |  |  |  |
Percentage of original principal amount payable | 55.00% | 15.00% | 15.00% | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Facility payable |  |  |  |  |  |  |  |  | $ 636,000,000 |  |  |  |  | $ 636,000,000 |  |  |  |  |  |
Credit facility basis points |  |  |  |  |  |  |  |  | 225.00% |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  |

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