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Goodwill and intangible assets - Summary of Goodwill (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Sep. 30, 2024
Goodwill [Roll Forward]
Balance at beginning of year	$ 85,811	$ 85,811
Balance at end of year	$ 85,811	$ 85,811

X

- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration