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Summary Of Significant Accounting Policies (Assumptions And Weighted Average Fair Values Of Share-Based Payment Units Under Black-Scholes Option Pricing Model) (Details) (USD $)	12 Months Ended
	Dec. 30, 2012	Dec. 25, 2011	Dec. 26, 2010
Accounting Policies [Abstract]
Weighted-average fair value of grants	$ 4.38	$ 9.74	$ 7.51
Expected dividend yield	0.00%	0.00%	0.00%
Expected volatility	52.08%	49.91%	48.29%
Expected life (in years)	5 years 0 months 22 days	4 years 11 months 23 days	4 years 11 months 5 days
Risk-free interest rate	0.75%	2.138%	1.845%

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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