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Income taxes - Schedule of Net Deferred Tax Position (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
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Income Tax Disclosure [Abstract] |  |
Balance of tax jurisdictions with net deferred tax assets | $ 6,834 | $ 7,691
Balance of tax jurisdictions with net deferred tax liabilities | (26,377) | (20,106)
Net deferred tax liabilities | $ (19,543) | $ (12,415)

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