Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Mar. 31, 2022	Sep. 30, 2021
Indefinite Lived Intangible Assets By Major Class [Line Items]
Cost	$ 128,617	$ 55,517
Accumulated Amortization	32,253	26,783
Net	$ 96,364	$ 28,734
Completed technologies
Indefinite Lived Intangible Assets By Major Class [Line Items]
Weighted Average Amortization Period (in years)	6 years 10 months 24 days	6 years 7 months 6 days
Cost	$ 95,761	$ 34,361
Accumulated Amortization	16,542	13,311
Net	$ 79,219	$ 21,050
Customer relationships
Indefinite Lived Intangible Assets By Major Class [Line Items]
Weighted Average Amortization Period (in years)	4 years 8 months 12 days	4 years 7 months 6 days
Cost	$ 25,168	$ 20,168
Accumulated Amortization	15,012	12,905
Net	$ 10,156	$ 7,263
Trade names
Indefinite Lived Intangible Assets By Major Class [Line Items]
Weighted Average Amortization Period (in years)	5 years	4 years 8 months 12 days
Cost	$ 7,088	$ 988
Accumulated Amortization	691	567
Net	$ 6,397	$ 421
Covenants not to compete
Indefinite Lived Intangible Assets By Major Class [Line Items]
Weighted Average Amortization Period (in years)	3 years
Cost	$ 600
Accumulated Amortization	8
Net	$ 592