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Share-Based Compensation Plans - Effects of Stock-Based Compensation Expense Related to Stock-Based Awards to Employees and Non-Employees (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 27, 2019
Sep. 28, 2018
Sep. 29, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 23,792 $ 31,937 $ 36,335
Cost of revenue      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 2,936 3,869 3,189
Research and development      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 8,551 13,448 10,565
Selling, general and administrative      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 12,305 $ 14,620 $ 22,581