Commitments and Contingencies (Insurance, Future Payments) (Details) - USD ($) $ in Thousands	Dec. 29, 2019	Dec. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
2020	$ 20,468
2021	11,316
2022	7,341
2023	4,216
2024	2,392
Thereafter	11,220
Total	$ 56,953	$ 60,473

Claims payments under the self insurance reserve expected in the fifth fiscal year following the latest fiscal year.

No definition available.

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

Claims payments under the self insurance reserve expected in the fourth fiscal year following the latest fiscal year.

No definition available.

Name:	blmn_SelfInsuranceReserveExpectedPaymentsDueDueInFourYears
Namespace Prefix:	blmn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Claims payments under the self insurance reserve expected in the third fiscal year following the latest fiscal year.

No definition available.

Name:	blmn_SelfInsuranceReserveExpectedPaymentsDueDueInThreeYears
Namespace Prefix:	blmn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Claims payments under the self insurance reserve expected in the second fiscal year following the latest fiscal year.

No definition available.

Name:	blmn_SelfInsuranceReserveExpectedPaymentsDueDueInTwoYears
Namespace Prefix:	blmn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Claims payments under the self insurance reserve expected after the fifth fiscal year following the latest fiscal year.

No definition available.

Name:	blmn_SelfInsuranceReserveExpectedPaymentsDueDueThereafter
Namespace Prefix:	blmn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Claims payments under the self insurance reserve expected in the next fiscal year following the latest fiscal year.

No definition available.

Name:	blmn_SelfInsuranceReserveExpectedPaymentsDueNextTwelveMonths
Namespace Prefix:	blmn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Probable amount of future payments (undiscounted) the Company may be required to make for uninsured claims.

No definition available.

Name:	blmn_SelfInsuranceReserveUndiscounted
Namespace Prefix:	blmn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

No definition available.

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