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Financing receivables, net - Contractual maturities of outstanding financing receivables (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023
--- | --- | --- | --- | ---
Financing receivables, net |  |  |  |
2025 | $ 2,418 |  |  |
2026 | 2,384 |  |  |
2027 | 854 |  |  |
2028 | 58 |  |  |
Total payments | 5,714 |  |  |
Less: unearned interest income | (560) | $ (684) |  |
Less: allowance for credit losses | (35) | $ (37) | $ (77) | $ 0
Total, net of unearned interest income and allowance for credit losses | $ 5,119 |  |  |

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