Segment Reporting (Revenue by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jul. 01, 2018	Jun. 25, 2017	[2]	Jul. 01, 2018	Jun. 25, 2017	[2]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	$ 1,031,814	$ 1,036,458	[1]	$ 2,148,279	$ 2,191,169	[1]
U.S. segment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	922,355	920,796		1,921,062	1,964,469
International segment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	$ 109,459	$ 115,662		$ 227,217	$ 226,700

[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.