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Stock-based compensation (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 02, 2016 | Jul. 04, 2015 | Jul. 02, 2016 | Jul. 04, 2015 | May 09, 2012
Stock Options [Member] |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award [Line Items] |  |  |  |  |
Number of options granted in period (shares) |  | 0 | 0 | 0 |
Recognized stock-based compensation costs | $ 17 | $ 18 | $ 27 | $ 173 |
Recognized stock-based compensation costs, net of tax | 10 | $ 11 | 16 | 109 |
Pre-tax unrecognized compensation expense | $ 17 |  | $ 17 |  |
Weighted-average remaining period to recognize compensation expense |  |  | 7 months 20 days |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award [Line Items] |  |  |  |  |
Number of options granted in period (shares) | 0 | 85,000 | 182,000 |  |
Recognized stock-based compensation costs | $ 14,470 | $ 7,742 | $ 23,520 | 16,023 |
Recognized stock-based compensation costs, net of tax | 8,780 | $ 5,177 | 14,271 | $ 10,423 |
Pre-tax unrecognized compensation expense | $ 39,313 |  | $ 39,313 |  |
Number of restricted stock units granted (shares) |  |  |  | 243,000 |
Weighted-average grant-date fair value (in usd per share) |  | $ 190.62 | $ 184.88 | $ 185.66 |
Recognized expense over a weighted-average period (years) |  |  | 2 years 11 days |  |
2012 Incentive Plan [Member] |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award [Line Items] |  |  |  |  |
Maximum amount of common stock reserved for issuance (shares) |  |  |  |  | 3,200,000
Expiration year of 2012 Plan |  |  | Dec. 31, 2022 |  |
2012 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 Incentive Plan [Member] | Minimum [Member] | Stock Options [Member] |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award [Line Items] |  |  |  |  |
Vesting period (years) |  |  | 3 years |  |
2012 Incentive Plan [Member] | Minimum [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award [Line Items] |  |  |  |  |
Vesting period (years) |  |  | 3 years |  |
2012 Incentive Plan [Member] | Maximum [Member] | Stock Options [Member] |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award [Line Items] |  |  |  |  |
Vesting period (years) |  |  | 5 years |  |
2012 Incentive Plan [Member] | Maximum [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award [Line Items] |  |  |  |  |
Vesting period (years) |  |  | 5 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 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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