The number of shares purchased by employees under the Investment Share Purchase Program.

No definition available.

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Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Estimated Forfeiture Rate

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Share Based Compensation Arrangement By Share Based Payment Award Options Annual Vesting Percentage

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Share Based Compensation Arrangement by Share Based Payment Award, Options, Contractual Term

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Share Based Compensation Arrangement By Share Based Payment Award Options Percentage Annual Exercise Price Accretion

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Employee tenure requirement to participate in plan.

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Share Based Compensation Arrangement by Share Based Payment Award, Weighted Average Fair Value

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Stock Repurchase Program, Additional Authorized Amount

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Stock Repurchase Program, Cumulative Number of Shares Repurchased

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Stock Repurchase Program, Cumulative Shares Repurchased, Value

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Voluntary Payroll Deduction Period to Purchase Investment Shares

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No definition available.

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Unrecognized cost of unvested share-based compensation awards.

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

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Exercise or strike price stated in the contract for options indexed to the issuer's equity shares.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(1)
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-Name Accounting Standards Codification
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-Section 50
-Paragraph 5
-Subparagraph (a)(2)
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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Paragraph 2
-Subparagraph (a)(1)
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- Definition

Discount rate from fair value on purchase date that participants pay for shares.

+ References

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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
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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
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
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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.

+ References

No definition available.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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-Paragraph 2
-Subparagraph (a)(3)
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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

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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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-Name Accounting Standards Codification
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Number of options outstanding, including both vested and non-vested options.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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No definition available.

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- Definition

Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 2
-Subparagraph (c)
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Amount of stock repurchase plan authorized.

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No definition available.

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Common Stock and Share-Based Compensation - Additional Information (Detail) - USD ($)				12 Months Ended
	Feb. 10, 2016	Jan. 01, 2016	Jan. 01, 2008	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted in period - weighted average fair value				$ 128.54	$ 106.81	$ 60.99
Other than options granted in period				14,393
Shares reserved for issuance and options outstanding				1,127,162	1,380,444
Options granted in period exercise price				$ 283.22
Stock-based compensation expense				$ 6,665,000	$ 6,857,000	$ 7,318,000
Expected dividends				0.00%	0.00%	0.00%
Estimated forfeiture rate for equity awards that do not vest on January 1st				5.00%	5.00%	5.00%
Total fair value of options vested in period				$ 4,100,000	$ 3,800,000	$ 4,700,000
Aggregate intrinsic value of stock options exercised in period				37,700,000	$ 45,800,000	$ 12,500,000
Unrecognized compensation costs				$ 9,961,000
Unrecognized compensation costs, weighted average period				2 years 2 months 12 days
Repurchased shares of Class A Common Stock				11,538,680	10,921,933	10,892,459	10,696,731
Repurchased value of Class A Common Stock				$ 446,092,000	$ 307,387,000	$ 299,528,000	$ 269,943,000
Performance-Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for issuance and options outstanding				117,352
Stock-based compensation expense				$ 831,000	$ 1,378,000	$ 1,401,000
Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for issuance and options outstanding				452,319	603,092
Options granted in period exercise price				$ 135.40	$ 225.74
Non Employee Director Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted in period				5,640	6,696	9,864
Non Employee Director Options \| Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for issuance under stock option plan				550,000
Shares available for grant				102,933
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase to the expenditure limit for the Company's Stock Repurchase Program	$ 50,000,000
Subsequent Event \| Before Increase
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Repurchase Program limit	525,000,000
Subsequent Event \| After Increase
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Repurchase Program limit	$ 575,000,000
Subsequent Event \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted in period - weighted average fair value		$ 39.16
Option exercised, additional percentage		1.50%
Maximum \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted in period exercise price			$ 70
Maximum \| Non Employee Director Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, contractual term				10 years
Maximum \| Subsequent Event \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted in period exercise price		$ 150
Minimum \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted in period exercise price			$ 37.65
Minimum \| Subsequent Event \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted in period exercise price		201.91
Employee Stock Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				5 years
Options granted in period				18,723	7,090	40,925
Employee Stock Compensation Plan \| Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for issuance under stock option plan				6,000,000	6,700,000
Shares available for grant				1,400,000
Employee Stock Compensation Plan \| Performance-Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted in period				14,742		10,925
Employee Stock Compensation Plan \| Long-Term Performance-Based Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted in period						15,000
Employee Stock Compensation Plan \| Service Based Retention Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted in period				3,981		15,000
Employee Stock Compensation Plan \| Investment Share Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				5 years
Payroll deduction period				11 months
Shares employees elected to purchase				8,301	8,516	12,894
Employee Stock Compensation Plan \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted in period - weighted average fair value		$ 46.80
Employee Stock Compensation Plan \| Subsequent Event \| Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted in period		663,136
Employee Stock Compensation Plan \| Subsequent Event \| Performance-Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted in period		18,127
Employee Stock Compensation Plan \| Subsequent Event \| Service Based Retention Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted in period		70,502
Employee Stock Compensation Plan \| Subsequent Event \| Chief Executive Officer \| Service Based Retention Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted in period		574,507
Employee Stock Compensation Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, contractual term				10 years
Employee Stock Compensation Plan \| Maximum \| Investment Share Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Discount from current market value				40.00%
Employee Stock Compensation Plan \| Minimum \| Investment Share Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requirement tenure of employee for investment share program				1 year
Discount from current market value				0.00%
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				5 years
Other than options granted in period				6,092	16,432	11,987
Restricted Stock Awards \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		5 years
Other than options granted in period		8,921
Shares employees elected to purchase		9,133
Market Based Stock Option \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			5 years
Options granted in period			753,864
Vesting percentage per year			20.00%
Stock price			$ 42.00
Weighted average fair value per share			$ 8.41
Stock-based compensation expense				$ 500,000	$ 700,000	$ 1,000,000
Market Based Stock Option \| Subsequent Event \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		5 years
Options granted in period		574,507
Vesting percentage per year		20.00%
Stock price		$ 201.91