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Debt - Additional Information (Details) - USD ($) $ in Thousands |  |  |  |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 15, 2023 | Dec. 15, 2022 | Dec. 15, 2021 | Dec. 15, 2020 | Apr. 05, 2018 | May 31, 2022 | Oct. 31, 2021 | Mar. 31, 2021 | Mar. 31, 2020 | Sep. 30, 2019 | Nov. 30, 2017 | Jun. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2022
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annualized weighted average cost of debt |  |  |  |  |  |  |  |  |  |  |  | 6.10% |  | 3.70%
Asset coverage ratio requirement |  |  |  |  |  |  |  |  |  |  |  | 150.00% |  |
Credit Facility payable, at fair value (cost - $64,400 and $169,654, respectively) (See Notes 5 and 10) |  |  |  |  |  |  |  |  |  |  |  | $ 63,917 | $ 167,563 |
Notes payable to members |  |  |  |  |  |  |  |  |  |  |  | 76,200 | 97,000 |
2031 Asset-Backed Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of preferred shares of securitization issuer |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |
Preferred shares of securitization issuer |  |  |  |  |  |  |  |  |  | $ 55,400 |  |  |  |
Asset backed debt |  |  |  |  |  |  |  |  |  |  |  | 228,000 | 228,000 |
Unamortized fees |  |  |  |  |  |  |  |  |  |  |  | 1,400 | $ 1,900 |
SBA Debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securitization amount |  |  |  |  |  |  |  |  |  | 301,400 |  |  |  |
2026 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes issued |  |  |  |  |  |  | $ 85,000 | $ 100,000 |  |  |  | $ 185,000 |  |
Debt instrument, interest rate |  |  | 4.25% |  |  |  |  |  |  |  |  |  |  |
Interest payment terms |  |  |  |  |  |  |  |  |  |  |  | Interest on the 2026 Notes is paid semi-annually on April 1 and October 1 of each year, at a rate of 4.25% per year, commencing October 1, 2021. |  |
Debt instrument, periodic payment |  |  |  |  |  |  |  |  |  |  |  | semi-annually |  |
Percentage of public offering price per notes issued |  |  |  |  |  |  | 101.50% | 99.40% |  |  |  |  |  |
Debt instrument, maturity date |  |  |  | Apr. 01, 2026 |  |  |  |  |  |  |  |  |  |
2023 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes issued |  |  |  |  |  |  |  |  |  |  | $ 138,600 |  |  |
Notes payable to members |  |  |  |  |  |  |  |  |  |  | $ 138,600 |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  |  | 4.30% |  |  |  |  |
Interest payment terms |  |  |  |  |  |  |  |  |  |  |  | Interest on the 2023 Notes is payable semi-annually in arrears on June 15 and December 15 of each year, commencing June 15, 2018. |  |
Debt instrument, periodic payment |  |  |  |  |  |  |  |  |  |  |  | four annual installments |  |
Percentage of original principal amount payable |  | 15.00% | 15.00% | 15.00% |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, increase (decrease) |  |  |  |  |  |  |  |  | 3.80% |  |  |  |  |
2023 Notes | Scenario Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of original principal amount payable | 55.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Class A-1 Senior Secured Floating Rate Loans | 2031 Asset-Backed Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |  |  |  | $ 78,500 |  |  |  |
Reference rate description |  |  |  |  |  |  |  |  |  | three-month LIBOR plus 1.8% |  |  |  |
Percentage points added to reference rate |  |  |  |  |  |  |  |  |  | 1.80% |  |  |  |
Class A-2 Senior Secured Fixed Rate Notes due 2031 | 2031 Asset-Backed Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  | 3.70% |  |  |  |
Debt instrument |  |  |  |  |  |  |  |  |  | $ 15,000 |  |  |  |
Class B-1 Senior Secured Floating Rate Notes due 2031 | 2031 Asset-Backed Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |  |  |  | $ 14,000 |  |  |  |
Reference rate description |  |  |  |  |  |  |  |  |  | three-month LIBOR plus 2.9% |  |  |  |
Percentage points added to reference rate |  |  |  |  |  |  |  |  |  | 2.90% |  |  |  |
Class B-2 Senior Secured Fixed Rate Notes due 2031 | 2031 Asset-Backed Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  | 4.30% |  |  |  |
Debt instrument |  |  |  |  |  |  |  |  |  | $ 16,000 |  |  |  |
Class C 1 Secured Deferrable Floating Rate Notes due 2031 | 2031 Asset-Backed Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |  |  |  | $ 19,000 |  |  |  |
Reference rate description |  |  |  |  |  |  |  |  |  | LIBOR plus 4.0% |  |  |  |
Percentage points added to reference rate |  |  |  |  |  |  |  |  |  | 4.00% |  |  |  |
Class C-2 Secured Deferrable Fixed Rate Notes due 2031 | 2031 Asset-Backed Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  | 5.40% |  |  |  |
Debt instrument |  |  |  |  |  |  |  |  |  | $ 8,000 |  |  |  |
Class D Secured Deferrable Floating Rate Loans due 2031 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of notes issued by securitization issuer |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |
Class D Secured Deferrable Floating Rate Loans due 2031 | 2031 Asset-Backed Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |  |  |  | $ 18,000 |  |  |  |
Reference rate description |  |  |  |  |  |  |  |  |  |  |  | three-month LIBOR plus 4.8% |  |
Percentage points added to reference rate |  |  |  |  |  |  |  |  |  | 4.80% |  |  |  |
Class A 1 Senior Secured Floating Rate Notes due 2031 | 2031 Asset-Backed Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument |  |  |  |  |  |  |  |  |  | $ 77,500 |  |  |  |
Reference rate description |  |  |  |  |  |  |  |  |  | three-month LIBOR plus 1.8% |  |  |  |
Percentage points added to reference rate |  |  |  |  |  |  |  |  |  | 1.80% |  |  |  |
Class D Secured Deferrable Floating Rate Notes | 2031 Asset-Backed Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annualized weighted average cost of debt |  |  |  |  |  |  |  |  |  |  |  | 6.80% | 4.60% |
Percentage of notes issued by securitization issuer |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |
SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage points added to reference rate |  |  |  |  |  | 260.00% |  |  |  |  |  |  |  |
Senior Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset coverage ratio requirement |  |  |  |  |  |  |  |  |  |  |  | 210.00% | 178.00% |
Senior Securities | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset coverage ratio requirement |  |  |  |  | 150.00% |  |  |  |  |  |  |  |  |
Senior Securities | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset coverage ratio requirement |  |  |  |  | 200.00% |  |  |  |  |  |  |  |  |
Truist Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annualized weighted average cost of debt |  |  |  |  |  |  |  |  |  |  |  | 7.50% | 4.90% |
Credit Facility payable, at fair value (cost - $64,400 and $169,654, respectively) (See Notes 5 and 10) |  |  |  |  |  |  |  |  |  |  |  | $ 366,000 |  |
Basis points description |  |  |  |  |  |  |  |  |  |  |  | Credit Facility bears interest at SOFR (or an alternative risk-free floating interest rate index) plus 236 basis points and, after the revolving period, the rate will reset to Base Rate (or an alternative risk-free floating interest rate index) plus 250 basis points for the remaining two years, maturing in August 2026. |  |
Maturity date |  |  |  |  |  |  |  |  |  |  |  | Aug. 31, 2026 |  |
Revolving period end date |  |  |  |  |  |  |  |  |  |  |  | 2024-08 |  |
Outstanding borrowings |  |  |  |  |  |  |  |  |  |  |  | $ 64,400 | $ 169,700 |
Unused borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | $ 301,600 | $ 196,300 |
Percentage of equity interest in funding |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |
Truist Credit Facility | SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis points description |  |  |  |  |  |  |  |  |  |  |  | 236 basis points |  |

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