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Stock-Based Compensation (Tables)
6 Months Ended
Apr. 01, 2023
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 EndedSix Months Ended
 April 1,
2023
March 26,
2022
April 1,
2023
March 26,
2022
Cost of revenues$2.7 $2.6 $5.6 $4.9 
Research and development3.1 2.8 6.5 5.5 
Selling and marketing3.0 2.8 6.3 5.4 
General and administrative14.4 9.6 25.3 20.7 
$23.2 $17.8 $43.7 $36.5 
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 EndedSix Months Ended
 April 1,
2023
March 26,
2022
April 1,
2023
March 26,
2022
Risk-free interest rate4.3 %1.1 %4.3 %1.1 %
Expected volatility33.9 %34.2 %33.9 %34.2 %
Expected life (in years)4.84.84.84.8
Dividend yield— — — — 
Weighted average fair value of options granted$27.42 $20.80 $25.92 $21.02