Leases - Future Lease Payments Not Commenced (Details) $ in Millions	Jun. 30, 2020 USD ($)
Leases [Abstract]
Leases that have not commenced with future lease payments	$ 3.8

Lease Liability, Payments Due, Leases Not Commenced with Future Lease Payments, Excluding Purchase Options

No definition available.

Name:	brks_LeaseLiabilityPaymentsDueLeasesNotCommencedWithFutureLeasePaymentsExcludingPurchaseOptions
Namespace Prefix:	brks_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant