Share based compensation arrangement by share based payment award number of common stock reserved for issuance.

No definition available.

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- Definition

Share based compensation arrangement by share based payment award option awards contractual term.

+ References

No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.F)

-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

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

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

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- Definition

The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

No definition available.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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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- Definition

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.

+ References

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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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

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

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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).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

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

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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).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

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- Definition

Date the equity-based award expires, in CCYY-MM-DD format.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(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.

+ References

No definition available.

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- Definition

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(1)

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

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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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)(1)

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Stock-based compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014	Jul. 04, 2015	Jun. 28, 2014	May. 09, 2012
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]
Number of options granted in period		0	0	0
Stock Options [Member]
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]
Recognized stock-based compensation costs	$ 18	$ 191	$ 173	$ 474
Recognized stock-based compensation costs, net of tax	11	$ 121	109	300
Pre-tax unrecognized compensation expense	72		$ 72
Weighted-average remaining period to recognize compensation expense			1 year 1 month 21 days
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]
Number of options granted in period		0
Recognized stock-based compensation costs	7,742	$ 6,392	$ 16,023	13,723
Recognized stock-based compensation costs, net of tax	5,177	$ 4,049	10,423	$ 8,694
Pre-tax unrecognized compensation expense	$ 43,563		$ 43,563
Number of restricted stock units granted		85,000	243,000	189,000
Weighted-average grant-date fair value (in usd per share)		$ 190.62	$ 185.66	$ 144.75
Recognized expense over a weighted-average period (years)			2 years 6 months 22 days
2012 Long-term Incentive Plan [Member]
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]
Expiration year of 2012 Plan			Dec. 31, 2022
2012 Long-term Incentive Plan [Member] \| Stock Options [Member]
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]
Option awards contractual term (years)			10 years
2012 Long-term Incentive Plan [Member] \| Maximum [Member]
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]
Number of common stock reserved for issuance (shares)					3,200,000
2012 Long-term Incentive Plan [Member] \| Maximum [Member] \| Stock Options [Member]
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]
Vesting period			5 years
2012 Long-term Incentive Plan [Member] \| Maximum [Member] \| Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]
Vesting period			5 years
2012 Long-term Incentive Plan [Member] \| Minimum [Member] \| Stock Options [Member]
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]
Vesting period			3 years
2012 Long-term Incentive Plan [Member] \| Minimum [Member] \| Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]
Vesting period			3 years