The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

+ Details

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

- References

No definition available.

+ Details

Name:	us-gaap_BusinessCombinationGoodwillAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

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.

+ References

Reference 1: 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=77989000&loc=SL49117168-202975

Reference 2: 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

+ Details

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

- Definition

Cash inflow representing an adjustment to the purchase price of a previous acquisition.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585

+ Details

Name:	us-gaap_ProceedsFromPreviousAcquisition
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=brks_BrooksSemiconductorSolutionsGroupMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=brks_BrooksLifeSciencesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=brks_GenewizMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=brks_TecSemGroupAgMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=brks_FourtitudeLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=brks_BioSpeciManCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Acquisitions - Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended
Acquisitions - Goodwill (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jun. 30, 2019	Nov. 15, 2018	Sep. 30, 2018	Apr. 20, 2018	Apr. 06, 2018	Oct. 05, 2017
Goodwill
Goodwill		$ 490,545		$ 255,876
Brooks Semiconductor Solutions Group
Goodwill
Goodwill		47,963		47,963
Brooks Life Sciences
Goodwill
Goodwill		$ 442,582		$ 207,913
GENEWIZ
Goodwill
Goodwill			$ 236,015
Proceeds from settlement of business acquisition working capital adjustments	$ 300
GENEWIZ \| Brooks Life Sciences
Goodwill
Goodwill			236,000
Goodwill deductible for tax purposes			$ 0
Tec-Sem Group AG
Goodwill
Goodwill						$ 7,665
Goodwill deductible for tax purposes						0
Tec-Sem Group AG \| Brooks Semiconductor Solutions Group
Goodwill
Goodwill						$ 7,700
4titude Limited
Goodwill
Goodwill							$ 38,185
Goodwill deductible for tax purposes							0
4titude Limited \| Brooks Life Sciences
Goodwill
Goodwill							$ 38,185
BioSpeciMan Corporation
Goodwill
Goodwill					$ 2,700
Goodwill deductible for tax purposes					0
BioSpeciMan Corporation \| Brooks Life Sciences
Goodwill
Goodwill					$ 2,700