Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	6 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2022	Jun. 30, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 134,818	$ 127,163	$ 120,186	$ 63,096
Disclosure - Goodwill and Intangible Assets - Additional Information (Detail) [Line Items]
Amortization of intangible assets	$ 4,525	$ 9,176	13,547	7,505	$ 6,439
Acquisition-related costs and expenses
Disclosure - Goodwill and Intangible Assets - Additional Information (Detail) [Line Items]
Amortization of intangible assets			$ 13,500	$ 7,500	$ 6,400
Minimum
Disclosure - Goodwill and Intangible Assets - Additional Information (Detail) [Line Items]
Estimated useful lives of intangible assets			3 years
Maximum
Disclosure - Goodwill and Intangible Assets - Additional Information (Detail) [Line Items]
Estimated useful lives of intangible assets			7 years