Share-Based Compensation - Effects of Stock-Based Compensation Expense Related to Stock-Based Awards to Employees and Non-Employees (Detail) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Apr. 01, 2016 |
Apr. 03, 2015 |
Apr. 01, 2016 |
Apr. 03, 2015 |
|
| Components Of Salaries And Benefits [Line Items] | ||||
| Total stock-based compensation expense | $ 5,844 | $ 5,969 | $ 13,226 | $ 9,128 |
| Cost of Revenue [Member] | ||||
| Components Of Salaries And Benefits [Line Items] | ||||
| Total stock-based compensation expense | 493 | 549 | 950 | 895 |
| Research and Development [Member] | ||||
| Components Of Salaries And Benefits [Line Items] | ||||
| Total stock-based compensation expense | 1,671 | 1,165 | 3,508 | 2,127 |
| Selling, General and Administrative [Member] | ||||
| Components Of Salaries And Benefits [Line Items] | ||||
| Total stock-based compensation expense | $ 3,680 | $ 4,255 | $ 8,768 | $ 6,106 |