Acquisitions - Amounts of Assets and Liabilities at Fair Value as of Acquisition Date (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Feb. 11, 2020	Sep. 30, 2019	Nov. 15, 2018	Sep. 30, 2018	Apr. 20, 2018	Apr. 06, 2018	Oct. 05, 2017
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill	$ 501,536		$ 488,602		$ 255,876
RURO, Inc.
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Accounts receivable		$ 1,220
Prepaid expenses and other current assets		29
Goodwill		11,116
Intangible assets		6,042
Other assets		230
Accounts payable		(15)
Deferred revenue		(1,320)
Accrued compensation and benefits		(344)
Other current liabilities		(91)
Long-term deferred tax liabilities		(1,091)
Long-term operating lease liabilities		(147)
Total purchase price, net of cash acquired		$ 15,629
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				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, net of cash acquired				$ 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							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, net of cash acquired							$ 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								27,212
Accounts payable								(286)
Accrued liabilities								(845)
Long-term deferred tax liabilities								(5,090)
Total purchase price, net of cash acquired								$ 65,119
BioSpeciMan Corporation
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Accounts receivable						$ 300
Goodwill						2,700
Intangible assets						2,600
Assumed liabilities						700
Total purchase price, net of cash acquired						$ 5,200