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Shareholders' equity - Reconciliation of basic to diluted weighted average common shares outstanding (Details) - shares shares in Thousands | 3 Months Ended
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Apr. 02, 2017 | Mar. 27, 2016
Debt Instrument [Line Items] |  |
Basic (in shares) | 44,893 | 41,647
Dilutive effect of share-based awards (in shares) | 821 | 519
Dilutive effect of 3.875% Convertible Notes and warrants (in shares) | 901 | 6,616
Diluted (in shares) | 46,615 | 48,782
Senior Notes | 3.875% Convertible Senior Subordinated Notes due 2017 |  |
Debt Instrument [Line Items] |  |
Debt instrument, stated interest rate | 3.875% |

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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 40 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1930-109256 + Details
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