Accumulated other comprehensive income (loss) (Details) $ in Thousands	9 Months Ended
Sep. 28, 2019 USD ($)
Accumulated Other Comprehensive Income Rollforward [Roll Forward]
Beginning balance	$ 7,440,059
Current period other comprehensive income	(90,679)
Ending balance	7,765,279
Foreign currency translation adjustments
Accumulated Other Comprehensive Income Rollforward [Roll Forward]
Beginning balance	(782,102)
Current period other comprehensive income	(90,962)
Ending balance	(873,064)
Pensions, net of tax
Accumulated Other Comprehensive Income Rollforward [Roll Forward]
Beginning balance	(9,506)
Current period other comprehensive income	283
Ending balance	(9,223)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income Rollforward [Roll Forward]
Beginning balance	(791,608)
Ending balance	$ (882,287)

Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568740-111683

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 55
-Paragraph 4I
-URI http://asc.fasb.org/extlink&oid=116874947&loc=SL4590271-111686

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568447-111683

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant