Stock-Based Compensation (Schedule Of Summary Of RSU Activity) (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 28, 2015	Dec. 27, 2014
Stock-Based Compensation [Abstract]
Beginning of period, Unvested Restricted Stock Units	7,368,529
Awarded, Restricted Stock Units	413,108
Released, Restricted Stock Units	(190,951)
Forfeited, Restricted Stock Units	(137,262)
End of period, Restricted Stock Units	7,453,424	7,368,529
Restricted Stock Units expected to vest	6,541,680
Weighted Average Remaining Contractual Term (years)	1 year 6 months 18 days	1 year 8 months 23 days
Restricted Stock Units expected to vest, Weighted Average Remaining Contractual Term (years)	1 year 5 months 12 days
Beginning of period, Aggregate intrinsic value	$ 67,200,984
End of period, Aggregate intrinsic value	69,242,309	67,200,984
Restricted Stock Units expected to vest, Aggregate intrinsic value	$ 60,772,202