Investments - Additional Information (Details)
$ in Thousands |
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3 Months Ended |
6 Months Ended |
12 Months Ended |
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Jul. 26, 2023
USD ($)
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Mar. 31, 2026
USD ($)
Portfolio
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Mar. 31, 2025
USD ($)
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Mar. 31, 2026
USD ($)
Portfolio
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Mar. 31, 2025
USD ($)
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Sep. 30, 2025
USD ($)
Portfolio
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Dec. 31, 2025
USD ($)
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Jul. 21, 2025
USD ($)
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Dec. 23, 2024
USD ($)
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Aug. 28, 2024
USD ($)
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Mar. 31, 2022
USD ($)
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| Schedule Of Investments [Line Items] |
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| Purchases of investments, including PIK interest |
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$ 110,400
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$ 178,400
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$ 227,900
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$ 476,300
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| Sales and repayments of investments |
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113,400
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$ 263,100
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386,600
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$ 616,800
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| Total assets |
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1,258,063
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1,258,063
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$ 1,349,554
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| Credit facility payable |
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199,480
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$ 199,480
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$ 425,477
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| Subordinated Notes |
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| Schedule Of Investments [Line Items] |
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| Percentage of capital ownership in each of outstanding subordinated notes and equity interests |
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55.80%
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55.80%
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| Investments |
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140,300
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$ 140,300
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$ 140,300
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| Equity Interests in PSLF |
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| Schedule Of Investments [Line Items] |
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| Percentage of capital ownership in each of outstanding subordinated notes and equity interests |
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44.20%
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44.20%
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| Investments |
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82,400
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$ 82,400
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$ 82,400
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| Equity Interests in PSLF | Pantheon |
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| Schedule Of Investments [Line Items] |
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| Remaining commitments to fund |
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5,000
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5,000
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5,000
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| Equity Interests in PSLF | Pantheon Funding I |
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| Schedule Of Investments [Line Items] |
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| Remaining commitments to fund |
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7,100
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7,100
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7,100
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| CLO VII |
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| Schedule Of Investments [Line Items] |
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| Debt securitization |
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246,000
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246,000
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246,000
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| CLO VII | Class A-1a [Member] | Private Placement |
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| Schedule Of Investments [Line Items] |
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| Debt securitization |
$ 151,000
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| Investments Basis Spread Variable Rate |
2.70%
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| CLO VII | Class A1b [Member] | Private Placement |
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| Schedule Of Investments [Line Items] |
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| Interest rate at basis points |
6.50%
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| Debt securitization |
$ 20,000
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| CLO VII | Class A-2 [Member] | Private Placement |
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| Schedule Of Investments [Line Items] |
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| Debt securitization |
$ 12,000
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| Investments Basis Spread Variable Rate |
3.20%
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| CLO VII | Class B [Member] | Private Placement |
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| Schedule Of Investments [Line Items] |
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| Debt securitization |
$ 21,000
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| Investments Basis Spread Variable Rate |
4.10%
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| CLO VII | Class C [Member] | Private Placement |
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| Schedule Of Investments [Line Items] |
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| Debt securitization |
$ 24,000
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| CLO VII | Class C [Member] | Private Placement | SOFR |
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| Schedule Of Investments [Line Items] |
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| Investments Basis Spread Variable Rate |
4.70%
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| CLO VII | Class D [Member] | Private Placement |
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| Schedule Of Investments [Line Items] |
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| Debt securitization |
$ 18,000
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| CLO VII | Class D [Member] | Private Placement | SOFR |
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| Schedule Of Investments [Line Items] |
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| Investments Basis Spread Variable Rate |
7.00%
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| CLO VII | Class B (B-R) [Member] |
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| Schedule Of Investments [Line Items] |
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| Debt securitization |
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$ 21,000
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| CLO VII | Class C (C-R) [Member] |
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| Schedule Of Investments [Line Items] |
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| Debt securitization |
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$ 24,000
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| CLO VII | Class C (C-R) [Member] | SOFR |
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| Schedule Of Investments [Line Items] |
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| Investments Basis Spread Variable Rate |
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2.00%
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| CLO VII | Class D (D-R) [Member] |
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| Schedule Of Investments [Line Items] |
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| Debt securitization |
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$ 18,000
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| Investments Basis Spread Variable Rate |
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2.30%
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| CLO VII | Class D (D-R) [Member] | SOFR |
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| Schedule Of Investments [Line Items] |
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| Investments Basis Spread Variable Rate |
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3.40%
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| CLO VII | PSLF Subsidiary |
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| Schedule Of Investments [Line Items] |
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| Asset backed debt |
$ 300,000
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| CLO X |
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| Schedule Of Investments [Line Items] |
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| Asset backed debt |
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328,000
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328,000
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328,000
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| CLO X | Class A-1 [Member] | Private Placement |
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| Schedule Of Investments [Line Items] |
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| Debt securitization |
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$ 158,000
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| CLO X | Class A-1 [Member] | Private Placement | S O F R |
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| Schedule Of Investments [Line Items] |
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| Investments Basis Spread Variable Rate |
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1.59%
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| CLO X | Class A-1a [Member] | Private Placement |
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| Schedule Of Investments [Line Items] |
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| Debt securitization |
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$ 30,000
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| Investments Basis Spread Variable Rate |
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1.59%
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| CLO X | Class A-1W [Member] | Private Placement |
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| Schedule Of Investments [Line Items] |
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| Debt securitization |
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$ 40,000
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| CLO X | Class A-1W [Member] | Private Placement | S O F R |
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| Schedule Of Investments [Line Items] |
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| Investments Basis Spread Variable Rate |
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1.59%
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| CLO X | Class A-2W [Member] | Private Placement |
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| Schedule Of Investments [Line Items] |
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| Debt securitization |
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$ 16,000
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| CLO X | Class A-2W [Member] | Private Placement | S O F R |
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| Schedule Of Investments [Line Items] |
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| Investments Basis Spread Variable Rate |
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1.75%
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| CLO X | Class B [Member] | Private Placement |
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| Schedule Of Investments [Line Items] |
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| Debt securitization |
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$ 28,000
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| CLO X | Class B [Member] | Private Placement | S O F R |
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| Schedule Of Investments [Line Items] |
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| Investments Basis Spread Variable Rate |
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1.85%
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| CLO X | Class C [Member] | Private Placement |
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| Schedule Of Investments [Line Items] |
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| Debt securitization |
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$ 32,000
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| CLO X | Class C [Member] | Private Placement | S O F R |
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| Schedule Of Investments [Line Items] |
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| Investments Basis Spread Variable Rate |
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2.40%
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| CLO X | Class D [Member] | Private Placement |
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| Schedule Of Investments [Line Items] |
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| Debt securitization |
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$ 24,000
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| CLO X | Class D [Member] | Private Placement | S O F R |
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| Schedule Of Investments [Line Items] |
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| Investments Basis Spread Variable Rate |
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3.85%
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| CLO X | PSLF Subsidiary |
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| Schedule Of Investments [Line Items] |
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| Asset backed debt |
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$ 400,500
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| PSLF |
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| Schedule Of Investments [Line Items] |
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| Total assets |
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$ 1,370,710
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$ 1,370,710
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$ 1,315,447
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| Number of portfolio companies consisted of debt investments | Portfolio |
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114
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114
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109
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| Fair value of largest investment in a single portfolio company |
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$ 26,400
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$ 26,400
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$ 24,800
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| Fair value of investment in five largest portfolio company |
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124,700
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124,700
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121,400
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| Credit facility payable |
|
179,900
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179,900
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99,600
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| 2034 Asset-backed debt, net par |
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246,000
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$ 246,000
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246,000
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| PSLF | LLC Agreement | Maximum | PSLF and Pantheon Amendement |
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| Schedule Of Investments [Line Items] |
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| Ownership interest percentage |
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87.50%
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| PSLF | LLC Agreement | Minimum | PSLF and Pantheon Amendement |
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| Schedule Of Investments [Line Items] |
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| Ownership interest percentage |
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25.00%
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| PSLF | PSLF Subsidiary |
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| Schedule Of Investments [Line Items] |
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| Asset backed debt |
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$ 304,000
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| Asset backed debt, transfer of assets, description |
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2034. On the closing date of the transaction, in consideration of PSLF’s transfer to PennantPark CLO IV, LLC of the initial closing date loan portfolio, which included loans distributed to PSLF by certain of its wholly owned subsidiaries and us, PennantPark CLO IV, LLC transferred to PSLF 100% of the Preferred Shares of PennantPark CLO IV, LLC and 100% of the subordinated notes issued by PennantPark CLO IV
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| PSLF | PSLF Subsidiary | Senior Secured Revolving Credit Facility |
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| Schedule Of Investments [Line Items] |
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| Credit facility payable |
|
400,000
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|
$ 400,000
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|
$ 325,000
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| Credit facility interest rate description |
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interest at SOFR (or an alternative risk-free interest rate index) plus 225 basis points during the investment period and is subject to leverage and borrowing base restrictions.
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| Interest rate at basis points |
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225.00%
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| PSLF | Pantheon |
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| Schedule Of Investments [Line Items] |
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| Remaining commitments to fund |
|
8,200
|
|
$ 8,200
|
|
8,200
|
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| PSLF | Pantheon Funding I |
|
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| Schedule Of Investments [Line Items] |
|
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| Remaining commitments to fund |
|
$ 11,700
|
|
$ 11,700
|
|
$ 11,700
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