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Investments - Consolidated Statements of Operations for PSSL (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023
Investment income: |  |  |  |  |
Total investment income |  | $ 44,354 | $ 34,554 | $ 82,327 | $ 65,891
Expenses: |  |  |  |  |
Interest and expenses on debt |  | 14,688 | 9,752 | 23,630 | 19,610
Administration fees |  | 1,255 | 705 | 2,243 | 1,410
Total expenses |  | 25,266 | 17,810 | 43,790 | 35,415
Net investment income |  | 19,088 | 16,744 | 38,537 | 30,476
Realized and unrealized gain (loss) on investments and debt: |  |  |  |  |
Net change in unrealized appreciation (depreciation) on investments |  | 8,013 | (1,683) | 14,121 | (17,098)
Net realized and unrealized gain (loss) from investments and credit facility foreign currency translations |  | 12,023 | (9,501) | 15,042 | (24,853)
Net realized gain (loss) on: |  |  |  |  |
Net increase (decrease) in members' equity resulting from operations |  | 31,111 | 7,243 | 53,579 | 5,623
PennantPark Senior Secured Loan Fund I LLC |  |  |  |  |
Investment income: |  |  |  |  |
Interest Income |  | 26,916 | 21,292 | 52,964 | 40,908
Other income |  | 388 | 447 | 565 | 557
Total investment income |  | 27,304 | 21,739 | 53,529 | 41,465
Expenses: |  |  |  |  |
Interest and expenses on credit facility and asset-backed debt | [1] | 13,784 | 9,678 | 27,181 | 18,319
Interest and expenses on debt | [1] | 8,095 | 7,363 | 16,316 | 14,173
Administration fees | [1] | 577 | 516 | 1,135 | 1,024
General and administrative expenses | [1] | 231 | 280 | 493 | 580
Total expenses | [1] | 22,687 | 17,837 | 45,125 | 34,096
Net investment income |  | 4,617 | 3,902 | 8,404 | 7,369
Realized and unrealized gain (loss) on investments and debt: |  |  |  |  |
Net realized gain (loss) on Investments |  | (90) | (5,886) | (6,510) | (5,956)
Net change in unrealized appreciation (depreciation) on investments |  | 847 | 3,934 | 8,905 | (1,865)
Net realized and unrealized gain (loss) from investments and credit facility foreign currency translations |  | 757 | (1,952) | 2,395 | (7,821)
Net realized gain (loss) on: |  |  |  |  |
Net increase (decrease) in members' equity resulting from operations |  | $ 5,374 | $ 1,950 | $ 10,799 | $ (452)
[1] | No management or incentive fees are payable by PSSL. If any fees were to be charged, they would be separately disclosed in the consolidated statement of operations.

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