Goodwill and Other Intangible Assets, Net - Summary of Acquired Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Sep. 30, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 126,396	$ 125,969
Accumulated Amortization	49,652	42,772
Manufacturing Technologies, Core Products and Cell Lines [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	62,451	62,363
Accumulated Amortization	21,714	18,750
Tradenames, Licenses and Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	18,530	18,425
Accumulated Amortization	9,225	7,801
Customer Lists, Customer Relationships, and Supply Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	45,305	45,071
Accumulated Amortization	18,687	16,210
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	110	110
Accumulated Amortization	$ 26	$ 11