Common Stock Plans (Stock Options, Valuation Assumptions) (Details) (Stock options, Stock Incentive Plan, USD $)	0 Months Ended	12 Months Ended
Jan. 25, 2012	Jan. 26, 2011	Jan. 27, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock options \| Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Awards granted	371,040	293,978	281,110	371,040	293,978	281,110
Fair market value of stock option at grant	$ 18.79	$ 19.65	$ 16.47
Expected life of award	5 years 9 months 18 days	5 years 8 months 12 days	5 years 8 months 12 days
Risk-free interest rate	1.07%	2.45%	2.76%
Annualized volatility rate	39.60%	37.80%	37.30%
Dividend yield	1.00%	1.00%	1.10%

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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-Publisher FASB

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.D.2)

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

-Subsection 2

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Net number of share options (or share units) granted during the period.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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