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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 29, 2018	Sep. 29, 2018
Disaggregation of Revenue [Abstract]
Net sales	$ 3,279,678	$ 9,826,793
North America [Member]
Disaggregation of Revenue [Abstract]
Net sales	2,238,831	6,480,105
International [Member]
Disaggregation of Revenue [Abstract]
Net sales	1,040,847	3,346,688
Healthcare Distribution [Member]
Disaggregation of Revenue [Abstract]
Net sales	3,135,775	9,456,610
Healthcare Distribution [Member] | North America [Member]
Disaggregation of Revenue [Abstract]
Net sales	2,115,008	6,172,279
Healthcare Distribution [Member] | International [Member]
Disaggregation of Revenue [Abstract]
Net sales	1,020,767	3,284,331
Healthcare Distribution [Member] | Dental [Member]
Disaggregation of Revenue [Abstract]
Net sales	1,514,538	4,675,212
Healthcare Distribution [Member] | Dental [Member] | North America [Member]
Disaggregation of Revenue [Abstract]
Net sales	951,412	2,831,062
Healthcare Distribution [Member] | Dental [Member] | International [Member]
Disaggregation of Revenue [Abstract]
Net sales	563,126	1,844,150
Healthcare Distribution [Member] | Animal Health [Member]
Disaggregation of Revenue [Abstract]
Net sales	899,295	2,805,031
Healthcare Distribution [Member] | Animal Health [Member] | North America [Member]
Disaggregation of Revenue [Abstract]
Net sales	460,838	1,425,273
Healthcare Distribution [Member] | Animal Health [Member] | International [Member]
Disaggregation of Revenue [Abstract]
Net sales	438,457	1,379,758
Healthcare Distribution [Member] | Medical [Member]
Disaggregation of Revenue [Abstract]
Net sales	721,942	1,976,367
Healthcare Distribution [Member] | Medical [Member] | North America [Member]
Disaggregation of Revenue [Abstract]
Net sales	702,758	1,915,944
Healthcare Distribution [Member] | Medical [Member] | International [Member]
Disaggregation of Revenue [Abstract]
Net sales	19,184	60,423
Technology and Value-Added Services [Member]
Disaggregation of Revenue [Abstract]
Net sales	143,903	370,183
Technology and Value-Added Services [Member] | North America [Member]
Disaggregation of Revenue [Abstract]
Net sales	123,823	307,826
Technology and Value-Added Services [Member] | International [Member]
Disaggregation of Revenue [Abstract]
Net sales	$ 20,080	$ 62,357

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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