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Share-Based Compensation - Range of Assumptions Used and Resulting Weighted-Average Fair Value of Options Granted at Date of Grant (Detail) - $ / shares	3 Months Ended		9 Months Ended
	Oct. 03, 2015	Sep. 27, 2014	Oct. 03, 2015	Sep. 27, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Document Period End Date			Oct. 03, 2015
Range of assumptions used and resulting weighted-average fair value of options granted at the date of grant
Risk-free interest rate, minimum	1.50%	1.60%	1.30%	1.40%
Risk-free interest rate, maximum	1.80%	1.80%	1.90%	1.80%
Expected term (in years)	5 years 6 months	5 years 1 month 6 days	5 years 6 months	5 years 1 month 6 days
Estimated volatility, minimum	32.30%	31.70%	32.00%	31.70%
Estimated volatility, maximum	35.60%	32.10%	37.40%	33.10%
Expected dividends	0.00%	0.00%	0.00%	0.00%
Weighted-average fair value of options granted	$ 14.09	$ 6.79	$ 11.82	$ 7.85

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- Definition

The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.

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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.

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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

The estimated measure of the maximum 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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The estimated measure of the minimum 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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The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section 50



-Paragraph 2



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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



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-Name Accounting Standards Codification



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-SubTopic 10



-Section S99



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-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section 50



-Paragraph 2



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-Section D



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