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Stock-Based Compensation (Tables)
9 Months Ended
Jun. 26, 2021
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 26,
2021
June 27,
2020
June 26,
2021
June 27,
2020
Cost of revenues$1.9 $1.4 $6.4 $5.2 
Research and development1.4 1.7 6.2 6.3 
Selling and marketing2.3 2.3 7.7 7.9 
General and administrative8.9 14.5 29.8 31.9 
Restructuring0.9 — 0.9 2.4 
$15.4 $19.9 $51.0 $53.7 
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 EndedNine Months Ended
 June 26,
2021
June 27,
2020
June 26,
2021
June 27,
2020
Risk-free interest rate0.4 %1.7 %0.4 %1.7 %
Expected volatility35.0 %33.6 %35.0 %33.6 %
Expected life (in years)4.84.84.84.8
Dividend yield— — — — 
Weighted average fair value of options granted$19.17 $9.90 $20.07 $13.79