Goodwill and Intangible Assets - Goodwill Balance (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Goodwill [Roll Forward]
Balance at beginning of year	$ 85,811	$ 85,811
Sale of business (see note 6)	(3,616)	0
Balance at end of year	$ 82,195	$ 85,811