Business Segment, Geographic And Concentration Risk Information (Sales by Product Lines) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 01, 2016	Oct. 02, 2015	Jul. 03, 2015	Apr. 03, 2015	Jan. 02, 2015	Oct. 03, 2014	Jul. 04, 2014	Apr. 04, 2014	Jan. 01, 2016	Jan. 02, 2015	Jan. 03, 2014
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales	$ 317,567	$ 146,637	$ 174,890	$ 161,320	$ 169,726	$ 171,699	$ 172,081	$ 174,281	$ 800,414	$ 687,787	$ 663,945
Advanced Surgical, Orthopaedics, and Portable Medical [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales									243,385	216,339	208,990
Cardio And Vascular [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales									143,260	58,770	48,357
Cardiac/Neuromodulation [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales									356,064	330,921	328,455
Electrochem [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales									59,449	81,757	78,143
Interproduct-Line Eliminations [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales									(1,744)	0	0
Operating Segments [Member] | Greatbatch Medical [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales									649,977	678,285	660,902
Operating Segments [Member] | QiG [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales									13,571	9,502	3,043
Operating Segments [Member] | Lake Region Medical [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales									139,819	0	0
Intersegment Eliminations [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales									$ (2,953)	$ 0	$ 0