Share Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
Dec. 30, 2017	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Share-based Compensation Arrangement by Share-based Payment Award
Vesting Term, Minimum		1 year
Vesting Term		4 years
Number of shares available for future equity awards (in shares)	2,300,000	2,300,000
Share-based compensation		$ 29,202	$ 23,554	$ 19,420
Payments Related to Tax Withholding for Share-based Compensation		$ 816	$ 843	$ 2,997
Stock options, additional disclosures
Weighted average fair value, Granted (in dollars per share)		$ 14.56	$ 19.27	$ 19.53
Weighted average remaining contractual term, Outstanding, end of period (in years)		6 years 10 months 24 days	6 years 10 months 24 days	7 years 1 month 5 days	7 years 2 months 6 days
Weighted average remaining contractual rerm, Exercisable at end of period (in years)		5 years 3 months 18 days
Aggregate intrinsic value, Outstanding, beginning of period		$ 59,601	$ 119,050	$ 146,967
Aggregate intrinsic value, Outstanding, end of period	$ 50,145	50,145	$ 59,601	$ 119,050	$ 146,967
Aggregate intrinsic value, Exercisable at end of period	45,939	$ 45,939
Other information relative to restricted unit activity
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Description and Terms		0	0	0
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award
Total unrecognized compensation	$ 4,300	$ 4,300
Remaining weighted average expense recognition period (in years)	1 year 7 months 20 days
Shares issued as a result of vested restricted stock units (in shares)		39,314	48,267	72,206
Shares withheld to satisfy tax obligations (in shares)		11,755	10,236	35,342
Payments Related to Tax Withholding for Share-based Compensation		$ 816	$ 843	$ 2,997
Restricted stock units
Restricted, beginning of period (in shares)		194,031	219,617	277,347
Granted (in shares)		85,049	59,586	56,052
Exercised (in shares)		(51,069)	(58,503)	(107,548)
Forfeited (in shares)		(4,781)	(26,669)	(6,234)
Restricted, end of period (in shares)	223,230	223,230	194,031	219,617	277,347
Restricted stock units, additional disclosures
Weighted average grant date fair value, Restricted, beginning of period (in dollars per share)		$ 68.04	$ 60.99	$ 42.64
Weighted average grant date fair value, Granted (in dollars per share)		66.34	83.22	84.86
Weighted average grant date fair value, Exercised (in dollars per share)		64.64	52.51	25.97
Weighted average grant date fair value, Forfeited (in dollars per share)		79.65	76.51	63.57
Weighted average grant date fair value, Restricted, end of period (in dollars per share)	$ 67.92	$ 67.92	$ 68.04	$ 60.99	$ 42.64
Other information relative to restricted unit activity
Total grant date fair value of restricted units vested and exercised		$ 3,301	$ 3,072	$ 2,793
Total intrinsic value of restricted units vested and exercised		3,465	$ 5,104	$ 9,139
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award
Total unrecognized compensation	$ 19,800	$ 19,800
Remaining weighted average expense recognition period (in years)	1 year 10 months 24 days
Key assumptions in fair value determination
Expected price volatility, minimum (in hundredths)		25.10%	25.50%	27.30%
Expected price volatility, maximum (in hundredths)		26.00%	27.90%	28.80%
Risk-free interest rate, minimum (in hundredths)		1.70%	0.90%	1.20%
Risk-free interest rate, maximum (in hundredths)		1.90%	1.30%	1.50%
Forfeiture rate, minimum (in hundredths)		7.20%	7.10%	6.90%
Forfeiture rate, maximum (in hundredths)		7.20%	7.10%	6.90%
Dividend yield, minimum (in hundredths)		1.30%	0.90%	1.00%
Dividend yield, maximum (in hundredths)		1.30%	0.90%	1.00%
Stock option expiration date (in years)		10	10	10
Stock option activity
Outstanding, beginning of period (in shares)		3,973,747	3,861,506	4,083,426
Granted (in shares)		1,625,140	1,150,941	1,080,490
Exercised (in shares)		(309,904)	(851,118)	(1,116,828)
Canceled (in shares)		(290,457)	(187,582)	(185,582)
Outstanding, end of period (in shares)	4,998,526	4,998,526	3,973,747	3,861,506	4,083,426
Exercisable, end of period (in shares)	2,582,283	2,582,283
Stock options, additional disclosures
Weighted average exercise price, Outstanding, beginning of period (in dollars per share)		$ 65.43	$ 54.95	$ 41.93
Weighted average exercise price, Granted (in dollars per share)		72.11	86.05	83.70
Weighted average exercise price, Exercised (in dollars per share)		38.87	42.53	33.11
Weighted average exercise price, Cancelled (in dollars per share)		79.08	80.01	67.28
Weighted average exercise price, Outstanding, end of period (in dollars per share)	$ 68.46	68.46	$ 65.43	$ 54.95	$ 41.93
Weighted average exercise price, Exercisable, end of period (in dollars per share)	$ 60.46	$ 60.46
Other information relative to option activity
Total fair value of stock options vested		$ 15,996	$ 15,184	$ 13,207
Total intrinsic value of stock options exercised		$ 9,237	$ 39,696	$ 60,082
Employee Stock Option \| Minimum
Key assumptions in fair value determination
Weighted average expected lives (in years)		4 years 5 months	4 years 5 months	4 years 6 months
Employee Stock Option \| Maximum
Key assumptions in fair value determination
Weighted average expected lives (in years)		4 years 5 months	4 years 5 months	4 years 6 months
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation		$ 1,000	$ 1,100	$ 1,100
Discount rate of employee stock purchase plan (in hundredths)		15.00%
Shares of common stock issued for employee stock purchase plan (in shares)		83,155	69,562	68,428
Shares of common stock reserved for future issuance under the ESPP (in shares)	12,000,000	12,000,000
Employee Stock Purchase Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award
Shares of common stock reserved for future issuance under the ESPP (in shares)	16,000,000	16,000,000

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Reflects the period of time in years as to when the share-based award expires as specified in the award agreement.

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The minimum 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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The minimum 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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The maximum estimated percentage of options granted that are expected to be forfeited or cancelled before becoming fully vested.

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The minimum estimated percentage of options granted that are expected to be forfeited or cancelled before becoming fully vested.

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The total fair value of equity-based awards 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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Stock options, other information

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The intrinsic value of equity-based payment equity instruments, excluding stock (or unit) options, that vested and were exercised during the reporting period as calculated by applying the disclosed pricing methodology.

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Vesting Term, Maximum

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Vesting Term, Minimum

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Aggregate number of common shares reserved for future issuance.

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Unrecognized cost of unvested share-based compensation awards.

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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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Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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

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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).

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

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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

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

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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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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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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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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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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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

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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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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Description of significant modifications (such as a change in expiration dating, vesting rights, or exercise prices) to an equity-based compensation plan, including the terms of the modifications.

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Number of share instruments newly issued under a share-based compensation plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Subparagraph (f)(2)(i)
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- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

+ References

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- Definition

Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

+ References

No definition available.

+ Details

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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

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- Definition

Number of share options (or share units) exercised during the current period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
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