Description of the Business and Basis of Presentation Adoption of New Accounting Procurements 2014-09 (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended			6 Months Ended
		Jul. 01, 2018	Jun. 25, 2017		Jul. 01, 2018	Jun. 25, 2017		Apr. 01, 2018	Dec. 31, 2017		Mar. 26, 2017	Dec. 25, 2016	Dec. 27, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restaurant sales, franchise and other revenues		$ 1,031,814	$ 1,036,458	[1],[2]	$ 2,148,279	$ 2,191,169	[1],[2]
Other restaurant operating		238,379	248,412		491,724	499,536
Income from operations		32,924	41,342	[3]	111,295	118,176	[3]
Income before provision for income taxes		21,599	38,820	[3]	89,661	106,462	[3]
Provision for income taxes		(5,124)	2,988		(3,199)	20,992
Net income		26,723	35,832		92,860	85,470
Net income attributable to Bloomin’ Brands		$ 26,721	$ 35,133	[4]	$ 92,119	$ 83,758	[4]
Basic earnings per share		$ 0.29	$ 0.36	[4]	$ 1.00	$ 0.83	[4]
Diluted earnings per share		$ 0.28	$ 0.34	[4]	$ 0.97	$ 0.80	[4]
Deferred income tax assets, net		$ 67,945			$ 67,945				$ 60,486
Total assets		2,389,866			2,389,866				2,561,894
Unearned revenue		221,926			221,926				330,756
Total current liabilities		631,170			631,170				813,392
Other long-term liabilities, net		192,400			192,400				210,443	[5]
Total liabilities		2,298,396			2,298,396				2,480,663
Accumulated deficit		(902,038)			(902,038)				(913,191)
Total Bloomin’ Brands stockholders’ equity		81,229			81,229				70,342
Total stockholders’ equity		91,470	$ 136,156		91,470	$ 136,156			81,231			$ 226,063
Total liabilities and stockholders’ equity		2,389,866			2,389,866				2,561,894
Deferred gift card revenue [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Unearned revenue		213,286	201,805		213,286	201,805		$ 227,783	323,628		$ 217,872	331,803
Deferred loyalty revenue [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Unearned revenue									6,667
Deferred franchise fees [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Unearned revenue									461
Restaurant sales [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restaurant sales, franchise and other revenues		1,015,484	1,021,184	[1],[6]	2,114,487	2,165,015	[1],[6]
Franchise and other revenue [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restaurant sales, franchise and other revenues		16,330	15,274	[1]	33,792	26,154	[1]
Previously reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restaurant sales, franchise and other revenues			1,032,982			2,176,805
Other restaurant operating			244,124			492,064
Income from operations			42,154			111,284
Income before provision for income taxes			39,632			99,570
Provision for income taxes			3,303			18,318
Net income			36,329			81,252
Net income attributable to Bloomin’ Brands			$ 35,630			$ 79,540
Basic earnings per share			$ 0.36			$ 0.79
Diluted earnings per share			$ 0.35			$ 0.76
Deferred income tax assets, net									71,499
Total assets									2,572,907
Unearned revenue									378,227
Total current liabilities									860,863
Other long-term liabilities, net	[5]								205,745
Total liabilities									2,523,436
Accumulated deficit									(944,951)
Total Bloomin’ Brands stockholders’ equity									38,582
Total stockholders’ equity									49,471
Total liabilities and stockholders’ equity									2,572,907
Previously reported [Member] | Deferred gift card revenue [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Unearned revenue									371,455
Previously reported [Member] | Deferred loyalty revenue [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Unearned revenue									6,667
Previously reported [Member] | Deferred franchise fees [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Unearned revenue									105
Previously reported [Member] | Restaurant sales [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restaurant sales, franchise and other revenues			$ 1,019,957			$ 2,155,445
Previously reported [Member] | Franchise and other revenue [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restaurant sales, franchise and other revenues			13,025			21,360
Accumulated deficit [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total stockholders’ equity		$ (902,038)	(856,720)		$ (902,038)	(856,720)			(913,191)			$ (756,070)
Adjustments for new accounting pronouncement [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restaurant sales, franchise and other revenues			3,476			14,364
Other restaurant operating			4,288			7,472
Income from operations			(812)			6,892
Income before provision for income taxes			(812)			6,892
Provision for income taxes			(315)			2,674
Net income			(497)			4,218
Net income attributable to Bloomin’ Brands			$ (497)			$ 4,218
Basic earnings per share			$ (0.01)			$ 0.04
Diluted earnings per share			$ 0.00			$ 0.04
Deferred income tax assets, net									(11,013)
Total assets									(11,013)
Unearned revenue									(47,471)
Total current liabilities									(47,471)
Other long-term liabilities, net	[5]								4,698
Total liabilities									(42,773)
Accumulated deficit									31,760
Total Bloomin’ Brands stockholders’ equity									31,760
Total stockholders’ equity									31,760
Total liabilities and stockholders’ equity									(11,013)
Adjustments for new accounting pronouncement [Member] | Deferred gift card revenue [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Unearned revenue									(47,827)
Adjustments for new accounting pronouncement [Member] | Deferred loyalty revenue [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Unearned revenue									0
Adjustments for new accounting pronouncement [Member] | Deferred franchise fees [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Unearned revenue									$ 356
Adjustments for new accounting pronouncement [Member] | Restaurant sales [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restaurant sales, franchise and other revenues			$ 1,227			$ 9,570
Adjustments for new accounting pronouncement [Member] | Franchise and other revenue [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restaurant sales, franchise and other revenues			$ 2,249			$ 4,794
Adjustments for new accounting pronouncement [Member] | Accumulated deficit [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect of new accounting principle in period of adoption													$ 33,100

[1] See Note 1 - Description of the Business and Basis of Presentation for details of the impact of implementing ASU No. 2014-09.

[2] See Note 1 - Description of the Business and Basis of Presentation for details of the impact of implementing ASU No. 2014-09.

[3] See Note 1 - Description of the Business and Basis of Presentation for details of the impact of implementing ASU No. 2014-09.

[4] See Note 1 - Description of the Business and Basis of Presentation for details of the Net income and Earnings per share impact of implementing ASU No. 2014-09.

[5] Includes the non-current portion of deferred franchise fees.

[6] See Note 1 - Description of the Business and Basis of Presentation for details of the impact of implementing ASU No. 2014-09.