Business Segment, Geographic And Concentration Risk Information (Reconciliation of Segment Information) (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2016	Jan. 01, 2016	Jan. 02, 2015
Segment Reporting Information [Line Items]
Operating income as reported	$ 108,270	$ 13,146	$ 75,654
Unallocated other income (expense), net	(107,085)	(28,846)	925
Income (loss) before provision (benefit) for income taxes	1,185	(15,700)	76,579
Total depreciation and amortization	90,524	67,618	37,457
Expenditures for tangible long-lived assets, excluding acquisitions	54,372	48,054	25,646
Total assets	2,832,543	2,982,136	955,122
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income as reported	186,961	91,073	112,476
Total depreciation and amortization	85,530	64,121	34,007
Expenditures for tangible long-lived assets, excluding acquisitions	46,121	41,531	20,459
Total assets	2,699,168	2,832,913	837,754
Operating Segments [Member] | Medical Segment [Member]
Segment Reporting Information [Line Items]
Operating income as reported	185,448	83,784	91,677
Total depreciation and amortization	83,184	61,618	31,346
Expenditures for tangible long-lived assets, excluding acquisitions	44,670	40,931	19,838
Total assets	2,638,180	2,766,421	763,905
Operating Segments [Member] | Non-Medical Segment [Member]
Segment Reporting Information [Line Items]
Operating income as reported	1,513	7,289	20,799
Total depreciation and amortization	2,346	2,503	2,661
Expenditures for tangible long-lived assets, excluding acquisitions	1,451	600	621
Total assets	60,988	66,492	73,849
Unallocated Amount to Segment [Member]
Segment Reporting Information [Line Items]
Operating income as reported	(78,691)	(77,927)	(36,822)
Total depreciation and amortization	4,994	3,497	3,450
Expenditures for tangible long-lived assets, excluding acquisitions	8,251	6,523	5,187
Total assets	$ 133,375	$ 149,223	$ 117,368