Intangible Assets - Summary of Acquired Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 30, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 55,986	$ 56,125
Accumulated Amortization	33,721	33,012
Manufacturing Technologies, Core Products and Cell Lines [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	22,268	22,297
Accumulated Amortization	14,243	13,974
Trade Names, Licenses and Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	8,613	8,647
Accumulated Amortization	5,463	5,267
Customer Lists, Customer Relationships, and Supply Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	24,385	24,461
Accumulated Amortization	13,295	13,051
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	720	720
Accumulated Amortization	$ 720	$ 720