Discontinued Operations - Results of Discontinued Operations (Details) - Discontinued Operations, Disposed of by Sale - RX - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2021	Sep. 26, 2020	Oct. 02, 2021	Sep. 26, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	$ 500	$ 210,700	$ 405,100	$ 738,800
Cost of sales	100	149,800	258,400	496,200
Gross profit	400	60,900	146,700	242,600
Distribution	0	3,600	6,100	11,400
Research and development	200	11,900	30,800	42,100
Selling	100	7,600	16,300	22,300
Administration	4,900	8,700	35,600	23,200
Impairment charges	0	202,400	0	202,400
Total operating expenses	5,200	234,800	88,400	302,600
Restructuring	0	0	0	400
Other operating expense (income)	0	600	(400)	800
Total operating expenses	5,200	234,800	88,400	302,600
Operating income	(4,800)	(173,900)	58,300	(60,000)
Interest expense, net	0	700	800	3,200
Other (income) expense, net	(63,700)	1,500	(65,500)	(700)
Income before income taxes	58,900	(176,100)	123,000	(62,500)
Income tax expense (benefit)	63,900	4,900	38,500	21,500
Income (loss) from discontinued operations, net of tax	$ (5,000)	$ (181,000)	$ 84,500	$ (84,000)