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Changes in accumulated other comprehensive income (Details) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 26, 2020 | Sep. 28, 2019
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Beginning of Period |  | $ (350,933) | $ (276,476)
Other comprehensive income before reclassification |  | (32,675) | (49,425)
Amounts reclassified from accumulated other comprehensive income |  | 10,419 | (1,953)
Net current-period other comprehensive income |  | (22,256) | (51,367)
End of Period |  | (373,189) | (327,843)
Accumulated Other Comprehensive (income) Loss, Defined Benefit Plan, Tax |  | (47,300) | (35,800)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Tax |  | (15,300) | (7,300)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax |  | (9,300) | (9,900)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax |  | 1,300 | 1,000
Accounting Standards Update 2017-12 |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Adoption of ASU 2017-12 (2) | [1] |  | 11
Accumulated Translation Adjustment |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Beginning of Period |  | (105,705) | (112,771)
Other comprehensive income before reclassification |  | (3,213) | (27,190)
Amounts reclassified from accumulated other comprehensive income |  | 0 | 0
Net current-period other comprehensive income |  | (3,213) | (27,190)
End of Period |  | (108,918) | (139,961)
Accumulated Translation Adjustment | Accounting Standards Update 2017-12 |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Adoption of ASU 2017-12 (2) | [1] |  | 0
Accumulated Defined Benefit Plans Adjustment |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Beginning of Period |  | (228,336) | (170,938)
Other comprehensive income before reclassification |  | (6,184) | (4,966)
Amounts reclassified from accumulated other comprehensive income |  | 0 | 0
Net current-period other comprehensive income |  | 6,184 | 4,966
End of Period |  | (222,152) | (165,972)
Accumulated Defined Benefit Plans Adjustment | Accounting Standards Update 2017-12 |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Adoption of ASU 2017-12 (2) | [1] |  | 0
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Interest Rate Swap |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Beginning of Period |  | (16,892) | 7,233
Other comprehensive income before reclassification |  | (35,646) | (27,201)
Amounts reclassified from accumulated other comprehensive income |  | 10,419 | (1,953)
Net current-period other comprehensive income |  | (25,227) | (29,143)
End of Period |  | $ (42,119) | (21,910)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Interest Rate Swap | Accounting Standards Update 2017-12 |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Adoption of ASU 2017-12 (2) | [1] |  | $ 11
[1] | As of December 30, 2018, the company adopted ASU No. 2017-12, "Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities" using the modified retrospective method. The adoption of this guidance resulted in the recognition of less than $0.1 million as an adjustment to the opening balance of retained earnings.

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(4)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(a)(3)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(2)(ii) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e681-108580 + Details
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