Significant Accounting Policies – Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2016	Dec. 27, 2015	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating leases, remaining rental payments				$ 214,070
Future expected sublease rental income				$ 79,560
Accounting Standards Update 2016-09 | Restatement
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in net cash provided by operating activities due to retrospective application of ASU 2016-09	$ 6,200	$ 10,200
Increase in net cash used in financing activities due to retrospective application of ASU 2016-09	$ 6,200	$ 10,200
Accounting Standards Update 2014-09 | Forecast | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Expected decrease before income tax effects to opening balance of retained earnings			$ 20,000
Accounting Standards Update 2014-09 | Forecast | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Expected decrease before income tax effects to opening balance of retained earnings			$ 25,000