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Stock-Based Compensation - Stock-Based Compensation Expense in Consolidated Statements of Operations (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jul. 01, 2023
Jun. 25, 2022
Jul. 01, 2023
Jun. 25, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 16.9 $ 15.3 $ 60.6 $ 51.8
Cost of revenues        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 2.1 2.2 7.7 7.1
Research and development        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 2.1 1.8 8.6 7.3
Selling and marketing        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 2.9 2.6 9.2 8.0
General and administrative        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 9.8 $ 8.7 $ 35.1 $ 29.4