Stock-based Compensation Expense (Detail)	9 Months Ended
Sep. 25, 2020 $ / shares shares
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	1.41%
Dividend yield	0.90%
Volatility	31.80%
Expected term (in years)	4 years 9 months 18 days
Number of shares granted in period \| shares	64,636
Grant date fair value per unit (in usd per share) \| $ / shares	$ 13.67
Restricted Stock Units (RSUs) \| Director Equity Plan [Domain]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted in period \| shares	15,976
Grant date fair value per unit (in usd per share) \| $ / shares	$ 48.42
Restricted Stock Units (RSUs) \| Stock Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted in period \| shares	66,663
Grant date fair value per unit (in usd per share) \| $ / shares	$ 49.72

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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 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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- Definition

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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents 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
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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-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=115993241&loc=d3e301413-122809

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