Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2021
Goodwill and Intangible Assets [Line Items]
Goodwill	$ 62,305		$ 63,096
Amortization of intangible assets	$ 2,175	$ 1,693
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