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Equity-Based Compensation (Weighted-Average Assumptions Used For Employee Purchase Rights Granted Under Stock Purchase Plan) (Detail) (USD $)	9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	0.00%	0.00%
Expected volatility	35.90%	35.33%
Risk free interest rate	0.94%	2.01%
Stock Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair market value	34.93	35.86
Option price	33.18	34.07
Expected dividend yield	0.00%	0.00%
Expected volatility	21.00%	32.00%
Risk free interest rate	0.06%	0.09%

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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