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Basis of Presentation and Summary of Significant Accounting Policies - Concentrations of Credit Risk (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Product Information [Line Items] |  |  |
Finance receivables | $ 4,384 | $ 7,171 | $ 9,000
Customer A | Customer Concentration Risk | Financing Receivables |  |  |
Product Information [Line Items] |  |  |
Finance receivables | $ 3,000 | $ 7,400 |
Concentration risk percentage | 41.00% | 65.00% |
Customer B | Customer Concentration Risk | Financing Receivables |  |  |
Product Information [Line Items] |  |  |
Finance receivables | $ 1,900 | $ 2,500 |
Concentration risk percentage | 25.00% | 22.00% |
Customer C | Customer Concentration Risk | Financing Receivables |  |  |
Product Information [Line Items] |  |  |
Finance receivables | $ 1,300 | $ 1,500 |
Concentration risk percentage | 18.00% | 13.00% |

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