Stockholders' Equity (Stock-Based Compensation Expense) (Details) (USD $) In Millions, except Share data, unless otherwise specified		6 Months Ended	12 Months Ended
	Jun. 29, 2014	Jun. 29, 2014 Stock options [Member]	Jan. 01, 2012 2009 Plan [Member] Stock options [Member] Common Class B [Member]	Jun. 29, 2014 2009 Plan [Member] Stock options [Member] Common Class B [Member]	Dec. 29, 2013 2009 Plan [Member] Stock options [Member] Common Class B [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued for the exercise of stock options			1,439,627
Shares early exercised			473,958
Unvested portion of early exercised shares				7,163	63,151
Weighted average remaining vesting period, unvested stock options		4 years 11 months 27 days
Total unrecognized compensation cost	$ 54.8