Financial Statement Revision And 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. 25, 2011	Dec. 26, 2010	Dec. 27, 2009
Financial Statement Revision And Summary Of Significant Accounting Policies [Abstract]
Weighted-average fair value of grants	$ 9.74	$ 7.51	$ 3.59
Expected dividend yield	0.00%	0.00%	0.00%
Expected volatility	49.91%	48.29%	44.74%
Expected life (in years)	4.98	4.93	4.86
Risk-free interest rate	2.138%	1.845%	1.70%

Financial Statement Revision And 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. 25, 2011

Dec. 26, 2010

Dec. 27, 2009

Financial Statement Revision And Summary Of Significant Accounting Policies [Abstract]

Weighted-average fair value of grants

$ 9.74

$ 7.51

$ 3.59

Expected dividend yield

0.00%

Expected volatility

49.91%

48.29%

44.74%

Expected life (in years)

4.98

4.93

4.86

Risk-free interest rate

2.138%

1.845%

1.70%

- Definition

The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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- Definition

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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