Share-Based Compensation-Valuation Parameters (Details 1) (USD $)	12 Months Ended
Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012
Employee Stock Option [Member]
Fair value of stock options granted to employees, officers and non-employee board members and ESPP shares granted to employees
Dividend yield			0.00%
Expected volatility	32.00%	37.00%	43.00%
Risk-free interest rate	1.22%	0.74%	0.60%
Expected term	4 years 5 months	4 years 5 months	4 years 5 months
Estimated annual forfeiture rate	8.79%	8.51%	8.59%
Weighted-average fair value at grant date	$ 18.96	$ 16.26	$ 16.45
Employee Stock Purchase Plan Shares [Member]
Fair value of stock options granted to employees, officers and non-employee board members and ESPP shares granted to employees
Dividend yield			0.00%
Expected volatility	31.00%	34.00%	41.00%
Risk-free interest rate	0.07%	0.11%	0.15%
Expected term	0 years 6 months	0 years 6 months	0 years 6 months
Weighted-average fair value at grant date	$ 19.39	$ 13.08	$ 11.87
Maximum [Member] \| Employee Stock Option [Member]
Fair value of stock options granted to employees, officers and non-employee board members and ESPP shares granted to employees
Dividend yield	1.42%	1.65%
Maximum [Member] \| Employee Stock Purchase Plan Shares [Member]
Fair value of stock options granted to employees, officers and non-employee board members and ESPP shares granted to employees
Dividend yield	1.25%	1.65%
Minimum [Member] \| Employee Stock Option [Member]
Fair value of stock options granted to employees, officers and non-employee board members and ESPP shares granted to employees
Dividend yield	1.14%	0.00%
Minimum [Member] \| Employee Stock Purchase Plan Shares [Member]
Fair value of stock options granted to employees, officers and non-employee board members and ESPP shares granted to employees
Dividend yield	1.14%	0.00%

The estimated annual forfeiture rate utilized in calculation of share-based compensation expense during the period.

No definition available.

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- Definition

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

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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)

-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

-Subsection 2

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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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)(iv)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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