The number of shares purchased by employees under the investment share purchase program.

No definition available.

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- Definition

Share based compensation arrangement by share based payment award, fair value assumptions, estimated forfeiture rate.

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No definition available.

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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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Share based compensation arrangements by share based payment award options grants in period weighted average fair value over exercise price.

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No definition available.

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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=96867065&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.

+ References

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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-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
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-Paragraph 28
-Subparagraph (a)
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- Definition

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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- 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
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-Paragraph 2
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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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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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-Name Accounting Standards Codification
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- Definition

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

+ References

No definition available.

+ Details

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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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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Paragraph 2
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Number of options vested.

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No definition available.

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Weighted average grant-date fair value of options vested.

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Common Stock and Share-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands				12 Months Ended
	Jan. 01, 2018	Jan. 01, 2016	Jan. 01, 2008	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted in period - weighted average fair value				$ 72.52	$ 87.70	$ 128.54
Other than options granted in period				25,946
Stock option outstanding				1,156,997	1,348,233
Exercise Price Per Share				$ 150.10
Estimated forfeiture rate for equity awards that do not vest on January 1st				5.00%	5.00%	5.00%
Stock-based compensation expense				$ 6,316	$ 6,148	$ 6,665
Expected dividends				0.00%	0.00%	0.00%
Total fair value of options vested in period				$ 2,900	$ 9,900	$ 4,100
Aggregate intrinsic value of stock options exercised in period				14,900	$ 52,700	$ 37,700
Unrecognized compensation costs				$ 18,984
Unrecognized compensation costs, weighted average period				2 years 9 months 3 days
Option vested, number of shares				22,213	19,740	25,732
Option vested, weighted average fair value				$ 151.32	$ 114.12	$ 79.44
Repurchased shares of Class A Common Stock				13,447,346	12,483,556	11,538,680	10,921,933
Repurchased value of Class A Common Stock				$ 752,352	$ 607,750	$ 446,092	$ 307,387
Performance-Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense				$ 36	$ 203	$ 831
Non-Employee Director Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted in period				10,188	14,040	5,640
Common Class A \| Non-Employee Director Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for issuance				600,000
Shares available for grant				100,000
Maximum \| Non-Employee Director Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, contractual term				10 years
Employee Stock Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				5 years
Options granted in period				5,185	786,450	18,723
Employee Stock Compensation Plan \| Service-Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted in period					173,135	3,981
Employee Stock Compensation Plan \| Performance-Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted in period					38,808	14,742
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 years
Shares employees elected to purchase				10,146	9,199	8,301
Employee Stock Compensation Plan \| Chief Executive Officer \| Service-Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted in period					574,507
Employee Stock Compensation Plan \| Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for issuance				6,700,000
Shares available for grant				700,000
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	$ 82.69
Employee Stock Compensation Plan \| Subsequent Event \| Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted in period	17,531
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]
Other than options granted in period				15,800	21,653	6,092
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	18,873
Restricted Stock Awards \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				5 years
Restricted Stock Awards \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years
January 1, 2008 \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			5 years
Options granted in period			753,864
Stock option outstanding				150,773	301,546
Vesting percentage per year			20.00%
Stock price			$ 42.00
Exercise Price Per Share				$ 121.10	$ 99.85
Options granted in period, weighted average fair value			8.41
Stock-based compensation expense				$ 200	$ 300	$ 500
January 1, 2008 \| Maximum \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price Per Share			70
January 1, 2008 \| Minimum \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price Per Share			$ 37.65
Performance-Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option outstanding				35,885
Service-Based Awards \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option outstanding				574,507
January 1, 2016 \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		5 years
Options granted in period		574,507
Options granted in period - weighted average fair value		$ 39.16
Stock option outstanding				574,507	574,507
Vesting percentage per year		20.00%
Stock price		$ 201.91
Option exercised, additional percentage		1.50%
Exercise Price Per Share				$ 272.45	$ 226.72
Estimated forfeiture rate for equity awards that do not vest on January 1st				100.00%
January 1, 2016 \| Maximum \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted in period, weighted average fair value of stock over exercise price		$ 150
January 1, 2016 \| Minimum \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price Per Share		$ 201.91
Investment Share Program \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares employees elected to purchase	9,214