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Income taxes - Schedule of Net Deferred Tax Position (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
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Income Tax Disclosure [Abstract] |  |
Total of tax jurisdictions with net deferred tax assets | $ 990 | $ 1,915
Total of tax jurisdictions with net deferred tax liabilities | (194,638) | (24,737)
Net deferred tax liability | $ (193,648) | $ (22,822)

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