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Summary of Significant Accounting Policies (Fiscal Year End) (Details) $ in Millions	3 Months Ended				12 Months Ended
	Mar. 29, 2015 USD ($)	Dec. 28, 2014 USD ($)	Sep. 28, 2014 USD ($)	Mar. 30, 2014 USD ($)	Dec. 27, 2015 USD ($)	Dec. 28, 2014 USD ($)	Jan. 03, 2014 weeks
Fiscal Year End [Line Items]
Number of weeks per quarter in fifty two week fiscal years							13
Number of weeks in fourth quarter of fifty three week fiscal years							14
Increase in length of period from the corresponding prior year period					2 days
Reduction in length of period from the corresponding prior year period						3 days
Restaurant sales [Member]
Fiscal Year End [Line Items]
Change in fiscal period, estimated financial impact on reporting period | $	$ 24.3	$ (31.6)	$ (6.9)	$ (7.5)	$ 24.3	$ (46.0)
Net income attributable to Bloomin' Brands [Member]
Fiscal Year End [Line Items]
Change in fiscal period, estimated financial impact on reporting period | $	$ 4.9	$ 6.3	$ 1.4	$ 1.5	$ 4.9	$ (9.2)
Minimum [Member]
Fiscal Year End [Line Items]
Number of weeks in fiscal year							52
Maximum [Member]
Fiscal Year End [Line Items]
Number of weeks in fiscal year							53

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- Definition

Estimated financial impact in the current reporting period as compared to the prior year comparable reporting period resulting from a change in the Company's fiscal year.

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[Line Items] for Fiscal Year End [Table]

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The increase in the length of the period (in days) from the corresponding prior year period.

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- Definition

Represents the number of weeks in each quarter for the entity's 52-week fiscal years.

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The number of weeks in a fiscal year.

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- Definition

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The reduction in the length of the period (in days) from the corresponding prior year period.

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