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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

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