Supplemental Balance Sheet Information - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Mar. 31, 2022	Sep. 30, 2021
Intangible Assets [Line Items]
Definite-lived intangible assets, Accumulated Amortization	$ (18,657)	$ (16,824)
Definite-lived intangible assets, Net	32,931
Intangible assets, Gross Carrying Amount	52,168	53,878
Intangible assets, Net	$ 33,511	$ 37,054
Customer Lists and Relationships [Member]
Intangible Assets [Line Items]
Definite-lived intangible assets, Weighted Average Original Life (Years)	8 years 10 months 24 days	8 years 10 months 24 days
Definite-lived intangible assets, Gross Carrying Amount	$ 12,722	$ 13,216
Definite-lived intangible assets, Accumulated Amortization	(9,213)	(8,878)
Definite-lived intangible assets, Net	$ 3,509	$ 4,338
Developed Technology [Member]
Intangible Assets [Line Items]
Definite-lived intangible assets, Weighted Average Original Life (Years)	11 years 10 months 24 days	11 years 10 months 24 days
Definite-lived intangible assets, Gross Carrying Amount	$ 35,315	$ 36,531
Definite-lived intangible assets, Accumulated Amortization	(7,067)	(5,652)
Definite-lived intangible assets, Net	$ 28,248	$ 30,879
Patents and Other [Member]
Intangible Assets [Line Items]
Definite-lived intangible assets, Weighted Average Original Life (Years)	14 years 1 month 6 days	14 years 1 month 6 days
Definite-lived intangible assets, Gross Carrying Amount	$ 3,551	$ 3,551
Definite-lived intangible assets, Accumulated Amortization	(2,377)	(2,294)
Definite-lived intangible assets, Net	1,174	1,257
Definite-Lived Intangible Assets [Member]
Intangible Assets [Line Items]
Definite-lived intangible assets, Gross Carrying Amount	51,588	53,298
Definite-lived intangible assets, Accumulated Amortization	(18,657)	(16,824)
Definite-lived intangible assets, Net	32,931	36,474
Trademarks and Trade Names [Member]
Intangible Assets [Line Items]
Indefinite-lived intangible assets, Net	$ 580	$ 580