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Stock-Based Compensation - Stock-Based Compensation Expense in Consolidated Statements of Operations (Detail) - USD ($)
$ in Millions
3 Months Ended
Dec. 28, 2024
Dec. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 30.1 $ 28.7
Cost of revenues    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense 3.5 2.8
Research and development    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense 2.5 3.2
Selling and marketing    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense 3.7 3.2
General and administrative    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 20.4 $ 19.5