Summary of Significant Accounting Policies (Basis of Presentation) (Details)	12 Months Ended
Dec. 29, 2019
Accounting Policies [Abstract]
Reporting lag for Brazil operations in financial statements	1 month

Reporting lag for Brazil operations in the financial statements.

No definition available.

Name:	blmn_ReportingLagforBrazilOperationsinFinancialStatements
Namespace Prefix:	blmn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration