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Income taxes - Valuation allowance activity (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Valuation allowance activity    
Balance at beginning of year $ (19,089) $ (17,667)
Increases (703) (1,422)
Balance at end of year $ (19,792) $ (19,089)