Fair Value Measurements - Schedule of Changes in Investments Measured at Fair Value Using Level 3 Inputs (Details) - USD ($)
$ in Thousands |
9 Months Ended |
Jun. 30, 2026 |
Jun. 30, 2025 |
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
| Fair value, beginning of period |
$ 390,128
|
$ 295,825
|
| Fundings of (proceeds from) revolving loans, net |
2,121
|
1,334
|
| Fundings of investments |
34,168
|
82,498
|
| PIK interest and non-cash dividends |
1,695
|
1,539
|
| Proceeds from non-cash dividends |
(4)
|
(84)
|
| Proceeds from principal payments and sales of portfolio investments |
(25,043)
|
(20,662)
|
| Fair value, end of period |
397,960
|
362,103
|
| Debt Investments |
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
| Proceeds from non-cash dividends |
0
|
|
| Equity Investments |
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
| Proceeds from non-cash dividends |
(4)
|
|
| Debt Investments |
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
| Fair value, beginning of period |
383,033
|
291,377
|
| Fundings of (proceeds from) revolving loans, net |
2,121
|
1,334
|
| Fundings of investments |
33,455
|
80,899
|
| PIK interest and non-cash dividends |
1,663
|
1,468
|
| Proceeds from non-cash dividends |
|
0
|
| Proceeds from principal payments and sales of portfolio investments |
(23,759)
|
(20,497)
|
| Fair value, end of period |
391,670
|
355,573
|
| Equity Investments |
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
| Fair value, beginning of period |
7,095
|
4,448
|
| Fundings of (proceeds from) revolving loans, net |
0
|
0
|
| Fundings of investments |
713
|
1,599
|
| PIK interest and non-cash dividends |
32
|
71
|
| Proceeds from non-cash dividends |
|
(84)
|
| Proceeds from principal payments and sales of portfolio investments |
(1,284)
|
(165)
|
| Fair value, end of period |
$ 6,290
|
$ 6,530
|
| Location, Statement of Income, Balance [Axis]: us-gaap:DebtAndEquitySecuritiesUnrealizedGainLoss |
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
| Fair value, asset, recurring basis, unobservable input reconciliation, gain (loss), statement of income or comprehensive income [Extensible Enumeration] |
Net change in unrealized appreciation (depreciation) on investment transactions
|
Net change in unrealized appreciation (depreciation) on investment transactions
|
| Accretion of discounts and amortization of premiums |
$ (6,392)
|
$ 651
|
| Fair value, asset, recurring basis, unobservable input reconciliation, gain (loss), statement of income or comprehensive income [Extensible Enumeration] |
Net change in unrealized appreciation (depreciation) on investment transactions
|
Net change in unrealized appreciation (depreciation) on investment transactions
|
| Location, Statement of Income, Balance [Axis]: us-gaap:DebtAndEquitySecuritiesUnrealizedGainLoss | Debt Investments |
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
| Accretion of discounts and amortization of premiums |
$ (5,683)
|
$ (10)
|
| Location, Statement of Income, Balance [Axis]: us-gaap:DebtAndEquitySecuritiesUnrealizedGainLoss | Equity Investments |
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
| Accretion of discounts and amortization of premiums |
$ (709)
|
$ 661
|
| Location, Statement of Income, Balance [Axis]: us-gaap:ForeignCurrencyTransactionGainLossRealized |
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
| Fair value, asset, recurring basis, unobservable input reconciliation, gain (loss), statement of income or comprehensive income [Extensible Enumeration] |
Foreign currency transactions
|
Foreign currency transactions
|
| Accretion of discounts and amortization of premiums |
$ 6
|
$ (2)
|
| Fair value, asset, recurring basis, unobservable input reconciliation, gain (loss), statement of income or comprehensive income [Extensible Enumeration] |
Foreign currency transactions
|
Foreign currency transactions
|
| Location, Statement of Income, Balance [Axis]: us-gaap:ForeignCurrencyTransactionGainLossRealized | Debt Investments |
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
| Accretion of discounts and amortization of premiums |
$ 6
|
$ (2)
|
| Location, Statement of Income, Balance [Axis]: us-gaap:ForeignCurrencyTransactionGainLossRealized | Equity Investments |
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
| Accretion of discounts and amortization of premiums |
$ 0
|
$ 0
|
| Location, Statement of Income, Balance [Axis]: us-gaap:GrossInvestmentIncomeOperating |
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
| Fair value, asset, recurring basis, unobservable input reconciliation, gain (loss), statement of income or comprehensive income [Extensible Enumeration] |
Gross Investment Income, Operating
|
Gross Investment Income, Operating
|
| Accretion of discounts and amortization of premiums |
$ 932
|
$ 804
|
| Fair value, asset, recurring basis, unobservable input reconciliation, gain (loss), statement of income or comprehensive income [Extensible Enumeration] |
Gross Investment Income, Operating
|
Gross Investment Income, Operating
|
| Location, Statement of Income, Balance [Axis]: us-gaap:GrossInvestmentIncomeOperating | Debt Investments |
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
| Accretion of discounts and amortization of premiums |
$ 932
|
$ 804
|
| Location, Statement of Income, Balance [Axis]: us-gaap:GrossInvestmentIncomeOperating | Equity Investments |
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
| Accretion of discounts and amortization of premiums |
$ 0
|
$ 0
|
| Location, Statement of Income, Balance [Axis]: us-gaap:RealizedInvestmentGainsLosses |
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
| Fair value, asset, recurring basis, unobservable input reconciliation, gain (loss), statement of income or comprehensive income [Extensible Enumeration] |
Investments
|
|
| Accretion of discounts and amortization of premiums |
$ 447
|
|
| Fair value, asset, recurring basis, unobservable input reconciliation, gain (loss), statement of income or comprehensive income [Extensible Enumeration] |
Investments
|
|
| Location, Statement of Income, Balance [Axis]: us-gaap:RealizedInvestmentGainsLosses | Debt Investments |
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
| Accretion of discounts and amortization of premiums |
$ 0
|
|
| Location, Statement of Income, Balance [Axis]: us-gaap:RealizedInvestmentGainsLosses | Equity Investments |
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
| Accretion of discounts and amortization of premiums |
$ 447
|
|
| Location, Statement of Income, Balance [Axis]: us-gaap:UnrealizedGainLossOnDerivatives |
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
| Fair value, asset, recurring basis, unobservable input reconciliation, gain (loss), statement of income or comprehensive income [Extensible Enumeration] |
Translation of assets and liabilities in foreign currencies
|
Translation of assets and liabilities in foreign currencies
|
| Accretion of discounts and amortization of premiums |
$ (98)
|
$ 200
|
| Fair value, asset, recurring basis, unobservable input reconciliation, gain (loss), statement of income or comprehensive income [Extensible Enumeration] |
Translation of assets and liabilities in foreign currencies
|
Translation of assets and liabilities in foreign currencies
|
| Location, Statement of Income, Balance [Axis]: us-gaap:UnrealizedGainLossOnDerivatives | Debt Investments |
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
| Accretion of discounts and amortization of premiums |
$ (98)
|
$ 200
|
| Location, Statement of Income, Balance [Axis]: us-gaap:UnrealizedGainLossOnDerivatives | Equity Investments |
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
| Accretion of discounts and amortization of premiums |
$ 0
|
$ 0
|