Acquisitions - Purchase Consideration (Details) - USD ($) $ in Thousands							3 Months Ended	12 Months Ended
	Apr. 20, 2018	Oct. 05, 2017	Aug. 22, 2017	Jul. 05, 2017	Nov. 28, 2016	Nov. 30, 2015	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Business Acquisition [Line Items]
Non-cash consideration transferred									$ 10,348
Net cash outflow								$ 85,755	44,791	$ 125,248
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
PBMMI and Novare
Business Acquisition [Line Items]
Total purchase price				$ 34,300
Cash payment net of cash acquired and subject to working capital adjustments				$ 34,300
Cool Lab, LLC
Business Acquisition [Line Items]
Total purchase price					$ 15,200
Cash payment					4,800
Liabilities incurred					100
Non-cash consideration transferred					10,300
Liabilities arising from contingencies, amount recognized					700		$ 800	$ 800	$ 700
Equity method investments, fair value disclosure					$ 3,100
RURO, Inc.
Business Acquisition [Line Items]
Total purchase price			$ 5,500
Cash payment			5,200
Liabilities incurred			$ 400
BioStorage Technologies, Inc.
Business Acquisition [Line Items]
Total purchase price						$ 125,200
Cash payment						130,700
Seller's cash						2,800
Net cash outflow						128,000
Retention arrangements						2,500
Debt repayments						3,200
Transaction costs						$ 2,900