Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended									12 Months Ended
	Dec. 29, 2019		Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 30, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Revenue
Revenue from Contract with Customer, Excluding Assessed Tax										$ 2,883,673	$ 2,777,996	$ 2,256,982
Selling, general and administrative expenses										815,318	811,913	626,018
Research and development expenses										189,336	193,998	139,464
Restructuring and other costs, net	$ 1,560		$ 14,068	$ 6,161	$ 7,639	$ (1,942)	$ 6,508	$ 0	$ 6,578	29,428	11,144	12,657
Operating income from continuing operations	138,248	[1]	78,660	91,735	53,330	115,683	80,202	88,064	39,935	361,973	323,884	295,615
Interest and other expense, net										124,831	66,201	(1,103)
Income from continuing operations before income taxes	65,296	[1]	63,254	71,827	36,765	79,429	78,041	71,708	28,505	237,142	257,683	296,718
Provision for income taxes										9,389	20,208	139,828
Income from continuing operations	64,549	[1]	58,610	69,141	35,453	71,322	75,445	64,673	26,035	227,753	237,475	156,890
Income from discontinued operations before income taxes										0	0	650
(Loss) gain on disposition of discontinued operations before income taxes										0	(859)	179,615
(Benefit from) provision for income taxes on discontinued operations and dispositions										(195)	(1,311)	44,522
Income from discontinued operations and dispositions	(48)		(52)	(54)	(41)	(30)	1,103	(610)	(11)	(195)	452	135,743
Net income	$ 64,501	[1]	$ 58,558	$ 69,087	$ 35,412	$ 71,292	$ 76,548	$ 64,063	$ 26,024	$ 227,558	$ 237,927	$ 292,633
Basic earnings per share:
Income from continuing operations	$ 0.58	[1]	$ 0.53	$ 0.62	$ 0.32	$ 0.64	$ 0.68	$ 0.59	$ 0.24	$ 2.06	$ 2.15	$ 1.43
Income from discontinued operations and dispositions	0.00		0.00	0.00	0.00	0.00	0.01	(0.01)	0.00	0.00	0.00	1.24
Net income	0.58	[1]	0.53	0.62	0.32	0.64	0.69	0.58	0.24	2.06	2.15	2.67
Diluted earnings per share:
Income from continuing operations	0.58	[1]	0.53	0.62	0.32	0.64	0.68	0.58	0.23	2.04	2.13	1.42
Income from discontinued operations and dispositions	0.00		0.00	0.00	0.00	0.00	0.01	(0.01)	0.00	0.00	0.00	1.22
Net income	$ 0.58	[1]	$ 0.52	$ 0.62	$ 0.32	$ 0.64	$ 0.69	$ 0.57	$ 0.23	$ 2.04	$ 2.13	$ 2.64
Product [Member]
Revenue
Revenue from Contract with Customer, Excluding Assessed Tax										$ 2,017,042	$ 1,935,493	$ 1,477,414
Cost of Goods and Services Sold										956,398	908,228	707,962
Service [Member]
Revenue
Revenue from Contract with Customer, Excluding Assessed Tax										866,631	842,503	779,568
Cost of Goods and Services Sold										$ 531,220	$ 528,829	$ 475,266

[1] The fourth quarter of fiscal year 2019 includes a pre-tax loss of $31.2 million as a result of the mark-to-market adjustment on postretirement benefit plans. The fourth quarter of fiscal year 2018 includes a pre-tax loss of $21.4 million as a result of the mark-to-market adjustment on postretirement benefit plans. See Note 1 for a discussion of this accounting policy