Acquisitions - Purchase Consideration (Details) $ in Thousands					3 Months Ended	6 Months Ended
	Nov. 15, 2018 USD ($) customer	Apr. 20, 2018 USD ($)	Apr. 06, 2018 USD ($)	Oct. 05, 2017 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)
Business Acquisition [Line Items]
Net cash outflow						$ 442,704	$ 64,988
GENEWIZ
Business Acquisition [Line Items]
Total purchase price	$ 442,700
Working capital adjustment	$ 400
GENEWIZ | Scenario, Adjustment
Business Acquisition [Line Items]
Total purchase price					$ (4,000)
GENEWIZ | Minimum
Business Acquisition [Line Items]
Number of institutional customers | customer	4,000
Tec-Sem Group AG
Business Acquisition [Line Items]
Cash payment net of cash acquired and subject to working capital adjustments			$ 15,600
4titude Limited
Business Acquisition [Line Items]
Total purchase price				$ 65,100
Cash payment net of cash acquired and subject to working capital adjustments				64,800
Liabilities incurred				$ 400
BioSpeciMan Corporation
Business Acquisition [Line Items]
Total purchase price		$ 5,200
Cash payment net of cash acquired and subject to working capital adjustments		5,200
Working capital adjustment		$ 500