CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
Income Statement [Abstract]
Revenues	$ 693,616	$ 589,464	$ 529,675
Cost of revenues	405,696	351,968	319,336
Gross profit	287,920	237,496	210,339
Operating expenses:
Research and development	89,034	81,499	74,976
Selling, general and administrative	115,098	106,335	99,254
Total operating expenses	204,132	187,834	174,230
Operating income	83,788	49,662	36,109
Interest income	1,501	2,714	1,356
Interest expense	(864)	(1,915)	(3,314)
Other income (expense), net	750	602	(224)
Income before income taxes	85,175	51,063	33,927
Provision (benefit) for income taxes	6,652	11,717	(70,109)
Net income	$ 78,523	$ 39,346	$ 104,036
Net income per share:
Basic (in USD per share)	$ 1.02	$ 0.52	$ 1.42
Diluted (in USD per share)	$ 0.99	$ 0.51	$ 1.38
Weighted-average number of shares used in per share calculations:
Basic (in shares)	76,681	74,994	73,482
Diluted (in shares)	79,001	77,286	75,182

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