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Goodwill and Intangible Assets - Changes in Net Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Goodwill [Roll Forward]
Balance at beginning of period	$ 3,493	$ 3,493
Goodwill impairment adjustment	0	0
Currency translation	0	0
Balance at end of period	$ 3,493	$ 3,493

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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