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Business acquisition - Preliminary estimate of the intangible assets (Details) $ in Thousands		12 Months Ended
	Jun. 14, 2021 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Business Acquisition [Line Items]
Change in fair value of contingent consideration and indemnity holdback		$ (534)
Income tax benefit		$ (1,930)	$ 382	$ 292
iGenomX International Genomics Corporation (iGenomX)
Business Acquisition [Line Items]
Estimated fair value of acquired intangible assets	$ 18,410
Discount rate		8.5
Transaction costs		$ 800
Change in fair value of contingent consideration and indemnity holdback		500
Income tax benefit		2,000
Contingent consideration and indemnity holdback	$ 10,400	$ 9,900
Developed Technology | iGenomX International Genomics Corporation (iGenomX)
Business Acquisition [Line Items]
Estimated Weighted Average Useful Lives in Years	17 years
Estimated fair value of acquired intangible assets	$ 17,900
Customer relationships | iGenomX International Genomics Corporation (iGenomX)
Business Acquisition [Line Items]
Estimated Weighted Average Useful Lives in Years	1 year 6 months
Estimated fair value of acquired intangible assets	$ 510

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Amount of present value of liability arising from contingent consideration and indemnity holdback in a business combination.

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