Earnings Per Share (Schedule Of Anti-dilutive Common Share Equivalents) (Details) - shares shares in Thousands	12 Months Ended
	Dec. 27, 2015	Dec. 28, 2014	Dec. 29, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average potential common shares associated with anti-dilutive stock options and restricted stock units excluded from the computation of diluted EPS	2,416	1,959	2,368
Stock Options And Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average potential common shares associated with anti-dilutive stock options and restricted stock units excluded from the computation of diluted EPS	146		361
Deferred Compensation Arrangement
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average potential common shares associated with anti-dilutive stock options and restricted stock units excluded from the computation of diluted EPS	23		21