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Segment and Geographic Information (Sales by Product Lines) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 28, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 29, 2017	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales	$ 303,034	$ 305,088	$ 314,464	$ 292,426	$ 302,260	$ 286,168	$ 280,916	$ 266,736	$ 1,215,012	$ 1,136,080	$ 1,075,502
Medical Segment [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales									1,162,036	1,079,112	1,033,823
Medical Segment [Member] | Cardio And Vascular [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales									585,464	530,831	484,891
Medical Segment [Member] | Cardiac/Neuromodulation [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales									443,347	428,275	439,375
Medical Segment [Member] | Advanced Surgical, Orthopaedics, and Portable Medical [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales									133,225	120,006	109,557
Non-Medical Segment [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales									$ 52,976	$ 56,968	$ 41,679

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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
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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-Name Accounting Standards Codification
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-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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