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Shareholders' equity - accumulated other comprehensive income (loss) into income expense (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Oct. 01, 2017 | Jul. 02, 2017 | Apr. 02, 2017 | Dec. 31, 2016 | Sep. 25, 2016 | Jun. 26, 2016 | Mar. 27, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost of goods sold |  |  |  |  |  |  |  |  | $ 974,501 | $ 871,827 | $ 865,287
Income from continuing operations before taxes |  |  |  |  |  |  |  |  | 284,911 | 245,725 | 244,646
Taxes on income from continuing operations |  |  |  |  |  |  |  |  | (129,648) | (8,074) | (7,838)
Income from continuing operations | $ (42,847) | $ 79,398 | $ 78,363 | $ 40,349 | $ 60,876 | $ 66,200 | $ 59,395 | $ 51,180 | 155,263 | 237,651 | 236,808
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total reclassifications, net of tax |  |  |  |  |  |  |  |  | 4,502 | 8,013 | 4,616
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations before taxes |  |  |  |  |  |  |  |  | (95) | 4,511 | 679
Taxes on income from continuing operations |  |  |  |  |  |  |  |  | 84 | (1,010) | (196)
Income from continuing operations |  |  |  |  |  |  |  |  | (11) | 3,501 | 483
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges | Commodity Contract |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost of goods sold |  |  |  |  |  |  |  |  | (95) | 4,511 | 679
Reclassification out of Accumulated Other Comprehensive Income | Pension and Other Postretirement Benefit Plans |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations before taxes |  |  |  |  |  |  |  |  | 7,009 | 7,021 | 6,375
Taxes on income from continuing operations |  |  |  |  |  |  |  |  | (2,496) | (2,509) | (2,242)
Income from continuing operations |  |  |  |  |  |  |  |  | 4,513 | 4,512 | 4,133
Actuarial losses |  |  |  |  |  |  |  |  | 6,904 | 6,965 | 6,375
Prior-service credits |  |  |  |  |  |  |  |  | $ 105 | $ 56 | $ 0

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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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- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953 Reference 2: 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(10)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(15)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(8)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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