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Stock-Based Compensation (Tables)
3 Months Ended
Dec. 31, 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 Ended
 December 31,
2022
December 25,
2021
Cost of revenues$2.9 $2.3 
Research and development3.4 2.7 
Selling and marketing3.3 2.6 
General and administrative10.9 11.1 
$20.5 $18.7 
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 Ended
 December 31,
2022
December 25,
2021
Risk-free interest rate4.3 %1.1 %
Expected volatility33.9 %34.2 %
Expected life (in years)4.84.8
Dividend yield— — 
Weighted average fair value of options granted$25.81 $21.03