Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Sep. 30, 2025
Intangible Asset, Indefinite-Lived [Line Items]
Impairment of intangible assets			$ 5,800
Amortization of intangible assets	$ 600	$ 2,100	$ 1,677	$ 6,400
Weighted average useful life			1 year 9 months 18 days
Goodwill	258,954		$ 258,954		$ 258,954
Internally Developed Software
Intangible Asset, Indefinite-Lived [Line Items]
Amortization of intangible assets	$ 400		$ 1,242	$ 1,000