Significant Accounting and Reporting Policies (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 25, 2016	Sep. 24, 2017	Sep. 25, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Excess tax benefit amount		$ 700
Net cash from financing activities		(52,122)	$ (147,865)
Net cash for operating activities		$ (322,618)	(340,702)
Accounting Standards Update 2016-09, Statutory Tax Withholding Component [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash from financing activities			$ 900
Net cash for operating activities	$ 900