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Share-Based Compensation - Effects of Stock-Based Compensation Expense Related to Stock-Based Awards to Employees and Non-Employees (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Jul. 02, 2021 | Jul. 03, 2020 | Jul. 02, 2021 | Jul. 03, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total share-based compensation expense | $ 8,141 | $ 8,495 | $ 26,841 | $ 26,921
Cost of Revenue |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total share-based compensation expense | 777 | 814 | 2,482 | 2,771
Research and Development |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total share-based compensation expense | 3,198 | 2,921 | 10,183 | 9,939
Selling, General and Administrative |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total share-based compensation expense | $ 4,166 | $ 4,760 | $ 14,176 | $ 14,211

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