Intangible Assets - Summary of Acquired Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Sep. 30, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 56,114	$ 56,023
Accumulated Amortization	28,522	26,168
Manufacturing Technologies, Core Products and Cell Lines [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	22,294	21,921
Accumulated Amortization	12,466	11,540
Trade Names, Licenses and Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	8,643	9,037
Accumulated Amortization	4,139	3,947
Customer Lists, Customer Relationships, and Supply Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	24,457	24,385
Accumulated Amortization	11,467	10,511
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	720	680
Accumulated Amortization	$ 450	$ 170