Stock-Based Compensation (Schedule Of Activity Under Option Plans) (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 26, 2015	Dec. 27, 2014
Stock-Based Compensation [Abstract]
Outstanding beginning balance, Number of options	18,316,720
Granted, Number of options	847,892
Exercised, Number of options	(4,017,595)
Forfeited, Number of options	(136,344)
Expired, Number of options	(1,025,118)
Outstanding ending balance, Number of options	13,985,555	18,316,720
Vested and expected to vest, Number of options	13,731,955
Exercisable, Number of options	12,046,856
Outstanding beginning balance, Weighted average exercise price per share	$ 7.53
Granted, Weighted average exercise price per share	6.73
Exercised, Weighted average exercise price per share	6.66
Forfeited, Weighted average exercise price per share	6.55
Expired, Weighted average exercise price per shre	9.48
Outstanding ending balance, Weighted average exercise price per share	7.60	$ 7.53
Vested and expected to vest, Weighted average exercise price per share	7.62
Exercisable, Weighted average exercise price per share	$ 7.75
Outstanding, Weighted average remaining contractual term (years)	4 years 3 months 7 days	4 years 4 months 28 days
Vested and expected to vest, Weighted average remaining contractual term (years)	4 years 2 months 5 days
Exercisable, Weighted average remaining contractual term (years)	3 years 6 months 11 days
Outstanding beginning balance, Aggregate intrinsic value	$ 32,598,999
Outstanding ending balance, Aggregate intrinsic value	2,734,065	$ 32,598,999
Vested and expected to vest, Aggregate intrinsic value	2,722,645
Exercisable, Aggregate intrinsic value	$ 2,509,015