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Stock-Based Compensation (Tables)
9 Months Ended
Jun. 25, 2022
Share-based Payment Arrangement [Abstract]  
Stock-Based Compensation Expense in Consolidated Statements of Operations
The following presents stock-based compensation expense in the Company’s Consolidated Statements of Income:

 Three Months EndedNine Months Ended
 June 25,
2022
June 26,
2021
June 25,
2022
June 26,
2021
Cost of revenues$2.2 $1.9 $7.1 $6.4 
Research and development1.8 1.4 7.3 6.2 
Selling and marketing2.6 2.3 8.0 7.7 
General and administrative8.7 8.9 29.4 29.8 
Restructuring— 0.9 — 0.9 
$15.3 $15.4 $51.8 $51.0 
Weighted-Average Assumptions Utilized to Value Stock Options
The Company uses a binomial model to determine the fair value of its stock options. The weighted-average assumptions utilized to value these stock options are indicated in the following table:

 Three Months EndedNine Months Ended
 June 25,
2022
June 26,
2021
June 25,
2022
June 26,
2021
Risk-free interest rate1.1 %0.4 %1.1 %0.4 %
Expected volatility34.2 %35.0 %34.2 %35.0 %
Expected life (in years)4.84.84.84.8
Dividend yield— — — — 
Weighted average fair value of options granted$21.48 $19.17 $21.03 $20.07