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Summary of Significant Accounting Policies and Select Balance Sheet Information - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Intangible Assets [Line Items] |  |
Definite-lived intangible assets, Accumulated Amortization | $ (16,824) | $ (13,889)
Definite-lived intangible assets, Net | 36,474 |
Intangible assets, Gross Carrying Amount | 53,878 | 27,172
Intangible assets, Net | $ 37,054 | $ 13,283
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 | $ 13,216 | $ 13,356
Definite-lived intangible assets, Accumulated Amortization | (8,878) | (7,594)
Definite-lived intangible assets, Net | $ 4,338 | $ 5,762
Developed Technology [Member] |  |
Intangible Assets [Line Items] |  |
Definite-lived intangible assets, Weighted Average Original Life (Years) | 11 years 10 months 24 days | 11 years 6 months
Definite-lived intangible assets, Gross Carrying Amount | $ 36,531 | $ 9,685
Definite-lived intangible assets, Accumulated Amortization | (5,652) | (4,200)
Definite-lived intangible assets, Net | $ 30,879 | $ 5,485
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 | (2,294) | (2,095)
Definite-lived intangible assets, Net | 1,257 | 1,456
Definite-Lived Intangible Assets [Member] |  |
Intangible Assets [Line Items] |  |
Definite-lived intangible assets, Gross Carrying Amount | 53,298 | 26,592
Definite-lived intangible assets, Accumulated Amortization | (16,824) | (13,889)
Definite-lived intangible assets, Net | 36,474 | 12,703
Trademarks and Trade Names [Member] |  |
Intangible Assets [Line Items] |  |
Indefinite-lived intangible assets, Net | $ 580 | $ 580

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