Long-term Debt, Net Long-term Debt, Net (Amended Credit Agreement Narrative) (Details) - Subsequent event [Member] - Secured debt [Member]	May 04, 2020 USD ($)
Amended Credit Agreement [Member]
Debt instrument [Line Items]
Debt instrument, covenant, monthly minimum liquidity	$ 125,000,000.0
Amended Credit Agreement [Member] \| Eurocurrency Rate [Member]
Debt instrument [Line Items]
Debt instrument, basis spread on variable rate	2.75%
Amended Credit Agreement [Member] \| Base Rate [Member]
Debt instrument [Line Items]
Debt instrument, basis spread on variable rate	1.75%
Amended Credit Agreement [Member] \| Maximum [Member]
Debt instrument [Line Items]
Debt Instrument, covenant, monthly minimum liquidity, unrestricted cash in foreign subsidiaries	$ 25,000,000.0
Debt instrument, covenant, aggregate capital expenditures	100,000,000.0
Debt instrument, covenant, investment in foreign subsidiaries	$ 27,500,000
Amended Credit Agreement [Member] \| Minimum [Member] \| Eurocurrency Rate [Member]
Debt instrument [Line Items]
Debt instrument, interest rate, floor	0.00%
Letter of credit [Member]
Debt instrument [Line Items]
Letters of credit fee, percentage	2.75%
Revolving credit facility [Member]
Debt instrument [Line Items]
Line of credit facility, unused capacity, commitment fee percentage	0.40%

Limit of aggregate capital expenditures under the Amended Credit Agreement.

No definition available.

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Namespace Prefix:	blmn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Limit of aggregate investments in foreign subsidiaries under the Amended Credit Agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	blmn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The minimum monthly liquidity required, calculated as the sum of available capacity under the Company’s revolving credit facility, unrestricted domestic cash on hand and up to $25.0 million of unrestricted cash held by foreign subsidiaries.

+ References

No definition available.

+ Details

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Namespace Prefix:	blmn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Unrestricted cash held by foreign subsidiaries included in the monthly minimum liquidity calculation.

+ References

No definition available.

+ Details

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Namespace Prefix:	blmn_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

Stated fees for letters of credit issued against the revolving credit facility per the respective debt agreement, percentage

+ References

No definition available.

+ Details

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Namespace Prefix:	blmn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

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- Details

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Namespace Prefix:
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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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Namespace Prefix:
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- Details

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