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Shareholders' equity - Accumulated other comprehensive income into income expense (Details) - USD ($) $ in Thousands | 3 Months Ended
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Apr. 02, 2017 | Mar. 27, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Cost of goods sold | $ (232,321) | $ (199,746)
Total reclassifications, net of tax | 2,509 | 2,586
Cash Flow Hedges |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Cost of goods sold | 1,645 | 1,871
Total before tax | 1,645 | 1,871
Tax benefit | (267) | (341)
Total reclassifications, net of tax | 1,378 | 1,530
Actuarial losses |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total before tax | 1,726 | 1,622
Prior-service costs |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total before tax | 29 | 14
Pension and Other Postretirement Benefits Plans |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total before tax | 1,755 | 1,636
Tax benefit | (624) | (580)
Total reclassifications, net of tax | $ 1,131 | $ 1,056

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- Definition Total costs related to goods produced and sold during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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