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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 |  |

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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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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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 + Details
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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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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