Schedule of Information on Non Vested Restricted Stock (Detail) (Non-Vested Restricted Stock, USD $)	12 Months Ended
Dec. 29, 2012	Dec. 31, 2011	Dec. 25, 2010
Non-Vested Restricted Stock
Number of Shares
Beginning Balance	40,993	29,854	11,500
Granted	4,151	22,410	18,354
Vested	(8,732)	(8,333)
Forfeited	(1,693)	(2,938)
Ending Balance	34,719	40,993	29,854
Weighted Average Grant Date Fair Value
Beginning Balance	$ 42.03	$ 39.49	$ 34.82
Granted	$ 54.20	$ 44.82	$ 42.41
Vested	$ 44.35	$ 42.14
Forfeited	$ 45.21	$ 37.13
Ending Balance	$ 42.75	$ 42.03	$ 39.49

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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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).

+ References

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

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-Topic 718

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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-Subparagraph (c)(2)(i)-(ii)

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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