Acquisitions - Pro Forma Information - Additional Information (Details) - GENEWIZ $ in Millions	24 Months Ended
Sep. 30, 2019 USD ($)
Business Acquisition, Pro Forma Information [Abstract]
Depreciation	$ 1.6
Interest expense	$ 2.0

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

No definition available.

Name:	brks_BusinessAcquisitionProFormaInterestExpense
Namespace Prefix:	brks_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration