Business Segment, Geographic And Concentration Risk Information (Sales by Product Lines) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 30, 2016	Sep. 30, 2016	Jul. 01, 2016	Apr. 01, 2016	Jan. 01, 2016	Oct. 02, 2015	Jul. 03, 2015	Apr. 03, 2015	Dec. 30, 2016	Jan. 01, 2016	Jan. 02, 2015
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales	$ 359,591	$ 346,567	$ 348,382	$ 332,238	$ 317,567	$ 146,637	$ 174,890	$ 161,320	$ 1,386,778	$ 800,414	$ 687,787
Eliminations And Reconciling Items [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales									(5,592)	(1,744)	0
Medical Segment [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales									1,345,099	740,965	606,030
Medical Segment [Member] | Cardio And Vascular [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales									568,510	143,260	58,770
Medical Segment [Member] | Cardiac/Neuromodulation [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales									389,403	356,064	330,921
Medical Segment [Member] | Advanced Surgical, Orthopaedics, and Portable Medical [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales									392,778	243,385	216,339
Non-Medical Segment [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales									$ 41,679	$ 59,449	$ 81,757