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Net Income per Share
 9 Months Ended
Sep. 26, 2020
Earnings Per Share [Abstract]  
Net Income per Share Net Income per ShareThe following table reconciles the shares used in calculating basic net income per share and diluted net income per share (in thousands):
Three Months EndedNine Months Ended
September 26,
2020		September 28,
2019		September 26,
2020		September 28,
2019
Weighted-average shares used in computing basic net income per share77,029 75,280 76,436 74,749 
Add potentially dilutive securities1,780 2,011 2,098 2,014 
Weighted-average shares used in computing diluted net income per share78,809 77,291 78,534 76,763 
Securities not included as they would have been antidilutive264 — 354 23