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Net Income per Share
 9 Months Ended
Sep. 25, 2021
Earnings Per Share [Abstract]  
Net Income per Share Net Income per Share
The 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 25,
2021		September 26,
2020		September 25,
2021		September 26,
2020
Weighted-average shares used in computing basic net income per share77,869 77,029 77,643 76,436 
Add potentially dilutive securities1,160 1,780 1,547 2,098 
Weighted-average shares used in computing diluted net income per share79,029 78,809 79,190 78,534 
Securities not included as they would have been antidilutive121 264 109 354