Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Acquisitions - Goodwill (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 03, 2020	Sep. 30, 2020	Feb. 11, 2020
Goodwill
Goodwill	$ 513,093		$ 501,536
Brooks Semiconductor Solutions Group
Goodwill
Goodwill	48,230		48,359
Brooks Life Sciences Products
Goodwill
Goodwill	105,851		103,278
Brooks Life Sciences Services
Goodwill
Goodwill	$ 359,012		$ 349,899
Trans-Hit Biomarkers
Goodwill
Goodwill		$ 8,900
Goodwill deductible for tax purposes		$ 0
RURO, Inc.
Goodwill
Goodwill				$ 11,000
Goodwill deductible for tax purposes				$ 0