Condensed Consolidated Statements of Operations Condensed Consolidated Statement of Operations - USD ($) shares in Thousands	3 Months Ended	6 Months Ended
Jul. 03, 2021	Jun. 27, 2020	Jul. 03, 2021	Jun. 27, 2020
Income Statement [Abstract]
Product revenue	$ 305,118,000	$ 300,953,000	$ 604,161,000	$ 570,578,000
Cost of goods sold	112,206,000	109,369,000	214,374,000	193,365,000
Gross profit	192,912,000	191,584,000	389,787,000	377,213,000
Selling, general and administrative	93,833,000	98,461,000	190,533,000	188,338,000
Research and development	33,943,000	30,878,000	68,454,000	58,119,000
Litigation settlements and (awards)	0	25,000	0	(474,000)
Total operating expenses	127,776,000	129,364,000	258,987,000	245,983,000
Operating income	65,136,000	62,220,000	130,800,000	131,230,000
Non-operating income (loss)	80,000	1,405,000	(657,000)	4,751,000
Income before provision for income taxes	65,216,000	63,625,000	130,143,000	135,981,000
Provision for income taxes	14,981,000	7,853,000	26,525,000	15,753,000
Net income	$ 50,235,000	$ 55,772,000	$ 103,618,000	$ 120,228,000
Basic	$ 0.91	$ 1.02	$ 1.88	$ 2.21
Diluted	$ 0.88	$ 0.96	$ 1.80	$ 2.08
Basic	55,032	54,764	55,116	54,316
Diluted	57,379	58,204	57,630	57,913

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 924
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(a),(d))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227