Stock-Based Compensation - Range of Assumptions Used and Resulting Weighted-Average Fair Value of Options Granted at Date of Grant (Detail) - $ / shares	12 Months Ended
Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Range of assumptions used and resulting weighted-average fair value of options granted at the date of grant
Risk-free interest rate, minimum	2.30%	1.70%	1.00%
Risk-free interest rate, maximum	3.10%	2.20%	2.10%
Estimated volatility, minimum	26.80%	29.70%	29.80%
Estimated volatility, maximum	32.00%	32.10%	35.70%
Expected dividends	0.00%	0.00%	0.00%
Weighted-average fair value of options granted	$ 31.85	$ 27.81	$ 13.64
Minimum
Range of assumptions used and resulting weighted-average fair value of options granted at the date of grant
Expected term, years	5 years 2 months 12 days	5 years 6 months	5 years 6 months
Maximum
Range of assumptions used and resulting weighted-average fair value of options granted at the date of grant
Expected term, years	5 years 7 months 6 days	5 years 7 months 6 days	5 years 8 months 12 days

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.

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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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No definition available.

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- Definition

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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No definition available.

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- Definition

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

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No definition available.

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- Definition

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

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No definition available.

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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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- 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.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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