Acquisitions - Amounts of Assets and Liabilities at Fair Value as of Acquisition Date (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Nov. 15, 2018	Sep. 30, 2018	Apr. 20, 2018	Apr. 06, 2018	Oct. 05, 2017	Sep. 30, 2017	Aug. 22, 2017	Jul. 05, 2017	Nov. 28, 2016
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill	$ 488,602		$ 255,876				$ 207,154
GENEWIZ
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Accounts receivable		$ 28,566
Inventories		4,370
Prepaid expenses and other current assets		11,635
Property, plant and equipment		36,379
Goodwill		235,160
Intangible assets, net		189,129
Other assets		15,998
Current portion of long-term debt		(3,170)
Accounts payable		(6,522)
Deferred revenue		(67)
Accrued compensation and benefits		(5,145)
Other current liabilities		(10,073)
Long-term debt		(2,482)
Long term tax reserves		(13,400)
Long-term deferred tax liabilities		(34,993)
Other long-term liabilities		(2,681)
Total purchase price		$ 442,704
Tec-Sem Group AG
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Accounts receivable					$ 988
Inventories					4,297
Prepaid expenses and other current assets					4,038
Property, plant and equipment					85
Goodwill					7,665
Intangible assets, net					10,694
Accounts payable					(1,049)
Accrued liabilities					(6,962)
Long-term deferred tax liabilities					(1,391)
Accrued pension liability					(2,800)
Total purchase price					$ 15,565
4titude Limited
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Accounts receivable						$ 1,581
Inventories						2,667
Prepaid expenses and other current assets						140
Property, plant and equipment						1,555
Goodwill						38,185
Intangible assets, net						27,212
Accounts payable						(286)
Accrued liabilities						(845)
Long-term deferred tax liabilities						(5,090)
Total purchase price						$ 65,119
PBMMI and Novare
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Accounts receivable									$ 2,800
Prepaid expenses and other current assets									267
Property, plant and equipment									2,887
Goodwill									21,434
Intangible assets, net									8,600
Accounts payable									(699)
Deferred revenue									(385)
Accrued liabilities									(673)
Other long-term liabilities									(103)
Total purchase price									$ 34,128
Cool Lab, LLC
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Inventories										$ 1,283
Goodwill										8,527
Intangible assets, net										6,100
Accrued liabilities										(30)
Other long-term liabilities										(686)
Total purchase price										$ 15,194
BioSpeciMan Corporation
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Accounts receivable				$ 300
Goodwill				2,700
Intangible assets, net				2,600
Assumed liabilities				700
Total purchase price				$ 5,200
RURO, Inc.
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Accounts receivable								$ 100
Goodwill								1,600
Intangible assets, net								4,000
Deferred revenue								(200)
Total purchase price								$ 5,500