Net Income (Loss) Per Share (Schedule Of Net Income Per Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Net Income (Loss) Per Share [Abstract]
Net income (loss)	$ 82	$ (32,254)	$ (320,259)
Basic weighted average common shares outstanding	196,885,000	203,882,000	216,593,000
Dilutive effect of employee stock options and awards	3,260,000
Diluted weighted average common shares outstanding	200,145,000	203,882,000	216,593,000
Basic net income per share	$ 0.00	$ (0.16)	$ (1.48)
Diluted net income per share	$ 0.00	$ (0.16)	$ (1.48)
Stock-based awards not included in net loss per share, antidilutive	2,000,000	1,500,000