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Goodwill and intangible assets - Summary of Goodwill (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Sep. 30, 2023
Goodwill [Roll Forward]
Balance at beginning of year	$ 85,811	$ 85,811
Balance at end of year	$ 85,811	$ 85,811

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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