v3.23.3

Portfolio Investments - Narrative (Details) | 6 Months Ended | 12 Months Ended |  |  |  |
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Sep. 30, 2021 USD ($) | Sep. 30, 2023 USD ($) member borrower | Sep. 30, 2022 USD ($) borrower | Sep. 30, 2021 USD ($) | Aug. 15, 2023 | May 18, 2021 | Sep. 30, 2020 USD ($) | Feb. 25, 2020
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |  |  |  |  |  |  |
Investment owned, percent of net assets |  | 190.82% | 200.24% |  |  |  |  |
Investments at fair value |  | $ 2,892,420,000 | $ 2,494,111,000 |  |  |  |  |
Number of borrowers | borrower |  | 143 | 149 |  |  |  |  |
Money market funds, percent of net assets |  | 9.60% | 2.10% |  |  |  |  |
Cash, cash equivalents and restricted cash | $ 31,635,000 | $ 145,539,000 | $ 26,364,000 | $ 31,635,000 |  |  | $ 39,096,000 |
Restricted cash | 2,301,000 | 9,089,000 | 2,836,000 | 2,301,000 |  |  |  |
Net realized gains (losses) |  | (33,155,000) | 17,179,000 | 26,420,000 |  |  |  |
Net unrealized appreciation (depreciation) |  | (28,555,000) | (136,248,000) | 114,519,000 |  |  |  |
Credit facilities payable |  | 710,000,000 | 700,000,000 |  |  |  |  |
Assets |  | 3,217,839,000 | 2,646,313,000 |  |  |  |  |
Unfunded commitments |  | 232,740,000 | 224,239,000 |  |  |  |  |
Investment owned, at cost |  | 3,044,119,000 | 2,617,754,000 |  |  |  |  |
SLF JV I, LLC |  |  |  |  |  |  |  |
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |  |  |  |  |  |  |
Investments at fair value |  | 141,500,000 | 117,000,000 |  |  |  |  |
OCSI Glick JV LLC |  |  |  |  |  |  |  |
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |  |  |  |  |  |  |
Investments at fair value |  | $ 50,000,000 | $ 50,300,000 |  |  |  |  |
Investment Owned, At Fair Value |  |  |  |  |  |  |  |
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |  |  |  |  |  |  |
Investment owned, percent of net assets |  | 190.82% | 200.24% |  |  |  |  |
Investments at fair value |  | $ 2,892,420,000 | $ 2,494,111,000 |  |  |  |  |
Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |  |  |  |  |
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |  |  |  |  |  |  |
Concentration risk |  | 100.00% | 100.00% |  |  |  |  |
Senior secured debt |  |  |  |  |  |  |  |
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |  |  |  |  |  |  |
Investment owned, percent of net assets |  | 165.01% | 173.93% |  |  |  |  |
Investments at fair value |  | $ 2,501,385,000 | $ 2,166,409,000 |  |  |  |  |
Investment owned, at cost |  | $ 2,594,640,000 | $ 2,227,245,000 |  |  |  |  |
Senior secured debt | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |  |  |  |  |
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |  |  |  |  |  |  |
Concentration risk |  | 86.47% | 86.86% |  |  |  |  |
Subordinated debt securities, including JV debt instruments |  |  |  |  |  |  |  |
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |  |  |  |  |  |  |
Investments at fair value |  | $ 218,390,000 | $ 203,453,000 |  |  |  |  |
Subordinated debt securities, including JV debt instruments | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |  |  |  |  |
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |  |  |  |  |  |  |
Concentration risk |  | 7.50% | 8.10% |  |  |  |  |
SLF JV I |  |  |  |  |  |  |  |
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |  |  |  |  |  |  |
Investments at fair value |  | $ 141,500,000 | $ 117,000,000 |  |  |  |  |
SLF JV I Notes |  |  |  |  |  |  |  |
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |  |  |  |  |  |  |
Investments at fair value |  | 112,700,000 | 96,300,000 |  |  |  |  |
Investment owned, at cost |  | 112,700,000 | 96,300,000 |  |  |  |  |
Interest income |  | $ 12,700,000 | 8,000,000 | 7,400,000 |  |  |  |
Investment, basis spread, variable rate |  | 7.00% |  |  |  |  |  |
Investment, interest rate, floor |  | 1.00% |  |  |  |  |  |
SLF JV I, LLC |  |  |  |  |  |  |  |
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |  |  |  |  |  |  |
Investments at fair value |  | $ 28,900,000 | 20,700,000 |  |  |  |  |
Investment owned, at cost |  | 54,800,000 | 49,300,000 |  |  |  |  |
Dividend income |  | 4,200,000 | 2,900,000 | 900,000 |  |  |  |
OCSI Glick JV LLC |  |  |  |  |  |  |  |
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |  |  |  |  |  |  |
Investments at fair value |  | 50,000,000 | 50,300,000 |  |  |  |  |
Investment owned, at cost |  | 50,300,000 | 50,200,000 |  |  |  |  |
Glick JV Notes |  |  |  |  |  |  |  |
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |  |  |  |  |  |  |
Interest income | 2,400,000 | $ 6,700,000 | 4,700,000 |  |  |  |  |
Investment, basis spread, variable rate |  | 4.50% |  |  |  |  |  |
2025 Notes |  |  |  |  |  |  |  |
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |  |  |  |  |  |  |
Interest rate, percentage |  | 3.50% |  |  |  |  |  | 3.50%
2027 Notes |  |  |  |  |  |  |  |
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |  |  |  |  |  |  |
Interest rate, percentage |  | 2.70% |  |  |  | 2.70% |  |
2029 Notes |  |  |  |  |  |  |  |
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |  |  |  |  |  |  |
Interest rate, percentage |  | 7.10% |  |  | 7.10% |  |  |
The JVs |  |  |  |  |  |  |  |
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |  |  |  |  |  |  |
Money market funds, percent of net assets |  | 9.60% |  |  |  |  |  |
Cash, cash equivalents and restricted cash |  | $ 145,500,000 |  |  |  |  |  |
Restricted cash |  | 9,100,000 |  |  |  |  |  |
SLF JV I |  |  |  |  |  |  |  |
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |  |  |  |  |  |  |
Investments at fair value |  | $ 322,179,000 | $ 359,625,000 |  |  |  |  |
Number of borrowers | borrower |  | 48 | 60 |  |  |  |  |
Restricted cash |  | $ 2,987,000 | $ 5,642,000 |  |  |  |  |
Number of board of directors | member |  | 4 |  |  |  |  |  |
Number of board of directors selected by company | member |  | 2 |  |  |  |  |  |
Number of board of directors selected by counterparty | member |  | 2 |  |  |  |  |  |
Number of investment committee members selected by company | member |  | 1 |  |  |  |  |  |
Number of investment committee members selected by counterparty | member |  | 1 |  |  |  |  |  |
Investment owned, ownership percentage |  | 87.50% | 87.50% |  |  |  |  |
Credit facilities payable |  | $ 149,000,000 | $ 230,000,000 |  |  |  |  |
Assets |  | 376,104,000 | 385,227,000 |  |  |  |  |
Financial support funded by company and counterparty |  | 190,500,000 | 165,500,000 |  |  |  |  |
Financial support funded by company for investee |  | 166,700,000 | 144,800,000 |  |  |  |  |
Unfunded commitments |  | 13,100,000 | 35,000,000 |  |  |  |  |
Investment owned, at cost |  | 331,808,000 | 382,673,000 |  |  |  |  |
Interest income |  | 38,984,000 | 24,014,000 | 20,018,000 |  |  |  |
Investments sold |  | 31,800,000 | 9,700,000 | 48,000,000 |  |  |  |
Proceeds from sale of investments |  | 30,600,000 | 9,700,000 | 47,200,000 |  |  |  |
Gain (loss) on sale of investments |  | (200,000) | 500,000 | $ 2,500,000 |  |  |  |
SLF JV I | SLF JV I Notes |  |  |  |  |  |  |  |
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |  |  |  |  |  |  |
Unfunded commitments |  | 9,800,000 | 26,200,000 |  |  |  |  |
Financial support funded during the period |  | 16,400,000 |  |  |  |  |  |
SLF JV I | SLF JV I, LLC |  |  |  |  |  |  |  |
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |  |  |  |  |  |  |
Unfunded commitments |  | 3,300,000 | 8,800,000 |  |  |  |  |
Financial support funded during the period |  | 5,500,000 |  |  |  |  |  |
SLF JV I | SLF JV I Facility | Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |  |  |  |  |  |  |
Borrowing capacity |  | 270,000,000 | $ 270,000,000 |  |  |  |  |
Credit facilities payable |  | $ 149,000,000 |  |  |  |  |  |
SLF JV I | SLF JV I Facility | Revolving Credit Facility | Line of Credit | Until November 3, 2023 | Secured Overnight Financing Rate |  |  |  |  |  |  |  |
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |  |  |  |  |  |  |
Debt instrument, basis spread, variable rate |  | 2.00% |  |  |  |  |  |
SLF JV I | Kemper |  |  |  |  |  |  |  |
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |  |  |  |  |  |  |
Investment owned, ownership percentage |  | 12.50% | 12.50% |  |  |  |  |
OCSI Glick JV LLC |  |  |  |  |  |  |  |
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |  |  |  |  |  |  |
Investments at fair value |  | $ 123,343,000 | $ 133,144,000 |  |  |  |  |
Number of borrowers | borrower |  | 38 | 43 |  |  |  |  |
Restricted cash |  | $ 184,000 | $ 1,788,000 |  |  |  |  |
Number of board of directors | member |  | 4 |  |  |  |  |  |
Number of board of directors selected by company | member |  | 2 |  |  |  |  |  |
Number of board of directors selected by counterparty | member |  | 2 |  |  |  |  |  |
Number of investment committee members selected by company | member |  | 1 |  |  |  |  |  |
Number of investment committee members selected by counterparty | member |  | 1 |  |  |  |  |  |
Credit facilities payable |  | $ 53,000,000 | 82,082,000 |  |  |  |  |
Assets |  | 141,167,000 | 146,808,000 |  |  |  |  |
Financial support funded by company and counterparty |  | 84,000,000 | 84,000,000 |  |  |  |  |
Financial support funded by company for investee |  | 73,500,000 | 73,500,000 |  |  |  |  |
Investment owned, at cost |  | 127,788,000 | 140,083,000 |  |  |  |  |
Interest income | $ 4,643,000 | 14,043,000 | 9,703,000 |  |  |  |  |
Investments sold |  | 6,500,000 |  |  |  |  |  |
Proceeds from sale of investments |  | 6,300,000 |  |  |  |  |  |
Financial commitment to investee by company and counterparty, aggregate amount |  | 100,000,000 | 100,000,000 |  |  |  |  |
Financial commitment to investee, aggregate amount |  | 87,500,000 | 87,500,000 |  |  |  |  |
Financial commitment to investee by counterparty, aggregate amount |  | 12,500,000 | $ 12,500,000 |  |  |  |  |
OCSI Glick JV LLC | Glick JV LLC |  |  |  |  |  |  |  |
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |  |  |  |  |  |  |
Investments at fair value |  | $ 50,000,000 |  |  |  |  |  |
Investment owned, ownership percentage |  | 87.50% | 12.50% |  |  |  |  |
Unfunded commitments |  | $ 1,600,000 | $ 1,600,000 |  |  |  |  |
Investment owned, at cost |  | 50,000,000 |  |  |  |  |  |
Financial commitment to investee, aggregate amount |  | $ 8,700,000 | 8,700,000 |  |  |  |  |
OCSI Glick JV LLC | Glick JV Notes |  |  |  |  |  |  |  |
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |  |  |  |  |  |  |
Investments at fair value |  |  | $ 50,300,000 |  |  |  |  |
Investment owned, ownership percentage |  | 87.50% | 12.50% |  |  |  |  |
Unfunded commitments |  | $ 12,400,000 | $ 12,400,000 |  |  |  |  |
Investment owned, at cost |  |  | 50,300,000 |  |  |  |  |
Financial commitment to investee, aggregate amount |  | 78,800,000 | $ 78,800,000 |  |  |  |  |
OCSI Glick JV LLC | Glick JV Facility | Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |  |  |  |  |  |  |
Borrowing capacity |  | 80,000,000 |  |  |  |  |  |
Credit facilities payable |  | $ 53,000,000 |  |  |  |  |  |
OCSI Glick JV LLC | Glick JV Facility | Revolving Credit Facility | Line of Credit | Until November 3, 2023 | Secured Overnight Financing Rate |  |  |  |  |  |  |  |
Investment Company, Nonconsolidated Subsidiary [Line Items] |  |  |  |  |  |  |  |
Debt instrument, basis spread, variable rate |  | 2.00% |  |  |  |  |  |

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