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Investments - Additional Information (Details) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 31, 2023 USD ($) | Mar. 31, 2024 USD ($) Portfolio | Mar. 31, 2023 USD ($) | Mar. 31, 2024 USD ($) Portfolio | Mar. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) Portfolio | Apr. 30, 2023 USD ($) | Jan. 31, 2021 USD ($)
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Purchases of investments, including PIK interest |  | $ 339,100,000 | $ 85,600,000 | $ 642,500,000 | $ 151,200,000 |  |  |
Sales and repayments of investments |  | 144,800,000 | $ 62,600,000 | 248,700,000 | $ 125,600,000 |  |  |
Total assets |  | 1,615,840,000 |  | $ 1,615,840,000 |  | $ 1,179,611,000 |  |
Number of members appointed |  |  |  | four |  |  |  |
Quorum description |  |  |  | Quorum is defined as (i) the presence of two members of the board of directors or investment committee, provided that at least one individual is present that was elected, designated or appointed by each member; (ii) the presence of three members of the board of directors or investment committee, provided that the individual that was elected, designated or appointed by the member with only one individual present shall be entitled to cast two votes on each matter; and (iii) the presence of four members of the board of directors or investment committee shall constitute a quorum, provided that two individuals are present that were elected, designated or appointed by each member. |  |  |  |
Line of credit |  | 168,878,000 |  | $ 168,878,000 |  | 9,400,000 |  |
Credit facility interest rate description | SOFR plus 260 basis points |  |  |  |  |  |  |
Debt securitization |  |  |  |  |  |  | $ 297,800,000 | $ 300,700,000
SOFR |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Percentage points added to reference rate | 260.00% |  |  |  |  |  |  |
Pennant Park C L O I I Ltd |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Asset backed debt, transfer of assets, description |  |  |  | On the closing date of the transaction, in consideration of PSSL’s transfer to PennantPark CLO II, Ltd. of the initial closing date loan portfolio, which included loans distributed to PSSL by certain of its wholly owned subsidiaries and us, PennantPark CLO II, Ltd. transferred to PSSL 100% of the Preferred Shares of PennantPark CLO II, Ltd. and 100% of the Class E Notes issued by PennantPark CLO II, Ltd. |  |  |  |
PennantPark CLO VI, LLC |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Asset backed debt, transfer of assets, description |  |  |  | On the closing date of the transaction, in consideration of PSSL’s transfer to PennantPark CLO VI, LLC of the initial closing date loan portfolio, which included loans distributed to PSSL by certain of its wholly owned subsidiaries and us, PennantPark CLO VI, LLC transferred to PSSL 100% of the Preferred Shares of CLO VI, LLC. |  |  |  |
Senior Secured Revolving Credit Facility |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Line of credit | $ 325,000,000 |  |  |  |  |  |  |
PennantPark Senior Secured Loan Fund I LLC |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Total assets |  | $ 940,966,000 |  | $ 940,966,000 |  | $ 869,410,000 |  |
Number of portfolio companies consisted of debt investments | Portfolio |  | 106 |  | 106 |  | 105 |  |
Percentage of capital ownership in each of outstanding subordinated notes and equity interests |  |  |  | 87.50% |  | 12.50% |  |
Line of credit |  | $ 135,600,000 |  | $ 135,600,000 |  | $ 48,600,000 |  |
PennantPark Senior Secured Loan Fund I LLC | Senior Secured Revolving Credit Facility |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Line of credit | $ 260,000,000 |  |  |  |  |  |  |
PennantPark Senior Secured Loan Fund I LLC | Investment In Single Portfolio Company |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Fair value of largest investment in a single portfolio company |  | 21,400,000 |  | 21,400,000 |  | 18,500,000 |  |
PennantPark Senior Secured Loan Fund I LLC | Five Largest Investments |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Fair value of investment in five largest portfolio company |  | 95,600 |  | 95,600 |  | 83,400,000 |  |
PennantPark Senior Secured Loan Fund I LLC | First Lien Secured Debt |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Total investments |  | 210,100,000 |  | 210,100,000 |  | 210,100,000 |  |
Additional unfunded investment |  | 27,600,000 |  | 27,600,000 |  | 27,600,000 |  |
PennantPark Senior Secured Loan Fund I LLC | Equity Interests |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Total investments |  | 90,000,000 |  | 90,000,000 |  | 90,000,000 |  |
Additional unfunded investment |  | $ 11,800,000 |  | $ 11,800,000 |  |  |  |
Additional unfunded investment in equity |  |  |  |  |  | $ 11,800,000 |  |

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