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Stock-based compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  | 9 Months Ended
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Sep. 27, 2014 | Sep. 28, 2013 | Sep. 27, 2014 | Sep. 28, 2013 | Sep. 27, 2014 Stock Options [Member] | Sep. 28, 2013 Stock Options [Member] | Sep. 27, 2014 Stock Options [Member] | Sep. 28, 2013 Stock Options [Member] | Sep. 27, 2014 Restricted Stock Units (RSUs) [Member] | Sep. 28, 2013 Restricted Stock Units (RSUs) [Member] | Sep. 27, 2014 Restricted Stock Units (RSUs) [Member] | Sep. 28, 2013 Restricted Stock Units (RSUs) [Member] | May 09, 2012 2012 Long-term Incentive Plan [Member] Maximum [Member] | Sep. 27, 2014 2007 Incentive Plan [Member] | Sep. 27, 2014 2007 Incentive Plan [Member] Maximum [Member] Stock Options [Member] | Sep. 27, 2014 2007 Incentive Plan [Member] Maximum [Member] Restricted Stock Units (RSUs) [Member] | Sep. 27, 2014 2007 Incentive Plan [Member] Minimum [Member] Stock Options [Member] | Sep. 27, 2014 2007 Incentive Plan [Member] Minimum [Member] Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement by Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock reserved for issuance (shares) |  |  |  |  |  |  |  |  |  |  |  |  | 3,200,000 |  |  |  |  |
Expiration year of 2007 Plan |  |  | Dec. 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years | 5 years | 3 years | 3 years
Number of options granted in period | 0 | 0 | 0 | 0 |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Option awards contractual term (years) |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |
Recognized stock-based compensation costs |  |  |  |  | $ 191 | $ 251 | $ 666 | $ 1,107 | $ 7,119 | $ 4,085 | $ 20,831 | $ 12,727 |  |  |  |  |  |
Recognized stock-based compensation costs, net of tax |  |  |  |  | 121 | 159 | 422 | 701 | 4,510 | 2,588 | 13,196 | 8,063 |  |  |  |  |  |
Pre-tax unrecognized compensation expense |  |  |  |  | $ 404 |  | $ 404 |  | $ 35,753 |  | $ 35,753 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term |  |  |  |  |  |  | 7 months 28 days |  |  |  |  |  |  |  |  |  |  |
Number of restricted stock units granted |  |  |  |  |  |  |  |  |  | 2,000 | 189,000 | 301,000 |  |  |  |  |  |
Weighted-average grant-date fair value (in usd per share) |  |  |  |  |  |  |  |  |  | $ 115.79 | $ 144.75 | $ 110.14 |  |  |  |  |  |
Recognized expense over a weighted-average period (years) |  |  |  |  |  |  |  |  |  |  | 2 years 2 months 12 days |  |  |  |  |  |  |

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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 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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 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 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 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 + 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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- 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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