Net Income per Share (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Earnings Per Share [Abstract]
Weighted-average shares used in computing basic net income (loss) per share (In shares)	77,029	75,280	76,436	74,749
Add potentially dilutive securities (In shares)	1,780	2,011	2,098	2,014
Weighted-average shares used in computing diluted net income per share (In shares)	78,809	77,291	78,534	76,763
Anti-dilutive securities (In shares)	264	0	354	23