Income Taxes - Unrecognized Tax Benefits - Acquisitions (Details) $ in Thousands	12 Months Ended
Sep. 30, 2019 USD ($)
Business Acquisition [Line Items]
Additions for tax positions in prior year	$ 13,400
GENEWIZ
Business Acquisition [Line Items]
Additions for tax positions in prior year	$ 13,400

Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

Name:	us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration