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Stock-Based Compensation (Tables)
 9 Months Ended
Jun. 27, 2020
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 Operations:
 Three Months EndedNine Months Ended
 June 27,
2020		June 29,
2019		June 27,
2020		June 29,
2019
Cost of revenues$1.4  $1.5  $5.2  $5.5  
Research and development1.7  2.0  6.3  7.4  
Selling and marketing2.3  2.5  7.9  7.9  
General and administrative14.5  7.9  31.9  27.7  
Restructuring—  —  2.4  —  
$19.9  $13.9  $53.7  $48.5  
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 EndedNine Months Ended
 June 27,
2020		June 29,
2019		June 27,
2020		June 29,
2019
Risk-free interest rate1.7 %3.0 %1.7 %3.0 %
Expected volatility33.6 %34.3 %33.6 %34.3 %
Expected life (in years)4.84.84.84.8
Dividend yield—  —  —  —  
Weighted average fair value of options granted$9.90  $15.07  $13.79  $13.51