Income taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Tax Contingency [Line Items]
Income tax expense (benefit)	$ 622	$ (149)	$ 1,374	$ (10,703)
Abx Biologics Inc.
Income Tax Contingency [Line Items]
Income tax benefit, due to deferred tax liability as part of business acquisition		$ 100		$ 10,700