Condensed Consolidated Income Statements - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 05, 2020	Jun. 30, 2019	Jul. 05, 2020	Jun. 30, 2019
Revenue from Contract with Customer, Excluding Assessed Tax	$ 811,718	$ 722,517	$ 1,464,114	$ 1,371,254
Cost of Goods and Services Sold	364,374	374,724	708,747	715,655
Selling, general and administrative expenses	221,026	201,553	429,595	400,410
Research and development expenses	49,521	48,344	98,435	96,324
Restructuring and other costs, net	1,158	6,161	7,016	13,800
Operating income from continuing operations	175,639	91,735	220,321	145,065
Interest and other expense, net	10,812	19,908	20,805	36,473
Interest And Other Expense Net	10,812	(19,908)	20,805	(36,473)
Income from continuing operations before income taxes	164,827	71,827	199,516	108,592
Provision for income taxes	27,614	2,686	28,588	3,998
Income from continuing operations	137,213	69,141	170,928	104,594
Loss on disposition of discontinued operations before income taxes	0	0	0	0
Provision for income taxes on discontinued operations and dispositions	51	54	101	95
Loss from discontinued operations and dispositions	(51)	(54)	(101)	(95)
Net income	$ 137,162	$ 69,087	$ 170,827	$ 104,499
Basic earnings (loss) per share:
Income (loss) from continuing operations (per share)	$ 1.23	$ 0.62	$ 1.54	$ 0.94
Gain (loss) on discontinued operations and dispositions (per share)	(0.00)	(0.00)	(0.00)	(0.00)
Net income (per share)	1.23	0.62	1.54	0.94
Diluted earnings (loss) per share:
Income (loss) from continuing operations (per share)	1.23	0.62	1.53	0.94
Gain (loss) on discontinued operations and dispositions (per share)	(0.00)	(0.00)	(0.00)	(0.00)
Net income (per share)	$ 1.23	$ 0.62	$ 1.53	$ 0.94
Weighted average shares of common stock outstanding:
Basic (in shares)	111,329	110,845	111,225	110,694
Diluted (in shares)	111,869	111,528	111,756	111,411
Cash dividends per common share	$ 0.07	$ 0.07	$ 0.14	$ 0.14
Product [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 601,506	$ 502,114	$ 1,027,035	$ 940,836
Cost of Goods and Services Sold	240,494	238,455	446,684	444,731
Service [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	210,212	220,403	437,079	430,418
Cost of Goods and Services Sold	$ 123,880	$ 136,269	$ 262,063	$ 270,924