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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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