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Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Sep. 30, 2017
Intangible Assets [Line Items] |  |
Definite-lived intangible assets, Accumulated Amortization | $ (12,814) | $ (10,838)
Intangible assets, Gross Carrying Amount | 31,244 | 31,400
Intangible assets, Net | $ 18,430 | $ 20,562
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 | $ 18,168 | $ 18,293
Definite-lived intangible assets, Accumulated Amortization | (9,004) | (7,834)
Definite-lived intangible assets, Net | $ 9,164 | $ 10,459
Developed Technology [Member] |  |
Intangible Assets [Line Items] |  |
Definite-lived intangible assets, Weighted Average Original Life (Years) | 11 years 6 months | 11 years 8 months 12 days
Definite-lived intangible assets, Gross Carrying Amount | $ 9,675 | $ 9,297
Definite-lived intangible assets, Accumulated Amortization | (2,139) | (1,478)
Definite-lived intangible assets, Net | $ 7,536 | $ 7,819
Non-compete [Member] |  |
Intangible Assets [Line Items] |  |
Definite-lived intangible assets, Weighted Average Original Life (Years) | 5 years | 5 years
Definite-lived intangible assets, Gross Carrying Amount | $ 230 | $ 230
Definite-lived intangible assets, Accumulated Amortization | (138) | (103)
Definite-lived intangible assets, Net | $ 92 | $ 127
Patents and Other [Member] |  |
Intangible Assets [Line Items] |  |
Definite-lived intangible assets, Weighted Average Original Life (Years) | 16 years 6 months | 16 years 6 months
Definite-lived intangible assets, Gross Carrying Amount | $ 2,322 | $ 2,321
Definite-lived intangible assets, Accumulated Amortization | (1,533) | (1,423)
Definite-lived intangible assets, Net | 789 | 898
Definite-Lived Intangible Assets [Member] |  |
Intangible Assets [Line Items] |  |
Definite-lived intangible assets, Gross Carrying Amount | 30,395 | 30,141
Definite-lived intangible assets, Accumulated Amortization | (12,814) | (10,838)
Definite-lived intangible assets, Net | 17,581 | 19,303
In-Process Research and Development [Member] |  |
Intangible Assets [Line Items] |  |
Indefinite-lived intangible assets, Net | 269 | 679
Trademarks and Trade Names [Member] |  |
Intangible Assets [Line Items] |  |
Indefinite-lived intangible assets, Net | $ 580 | $ 580

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