Acquisitions Pro Forma Information (Details) (Dynamic Micro Systems, USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Mar. 31, 2014	Mar. 31, 2014
Dynamic Micro Systems
Business Acquisition [Line Items]
Revenue	$ 140,408	$ 259,853
Net income (loss) attributable to Brooks Automation, Inc.	$ 3,467	$ 2,860

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration