Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Sep. 30, 2021
Goodwill and Intangible Assets [Line Items]
Goodwill	$ 135,519		$ 135,519		$ 63,096
Amortization of intangible assets	$ 2,400	$ 1,700	$ 4,525	$ 3,352
Minimum
Goodwill and Intangible Assets [Line Items]
Estimated useful lives of intangible assets (in years)			2 years
Maximum
Goodwill and Intangible Assets [Line Items]
Estimated useful lives of intangible assets (in years)			7 years