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Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 03, 2021 | Mar. 28, 2020 | Apr. 03, 2021 | Mar. 28, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Stock-based compensation expense | $ 16,363 | $ 13,394 | $ 31,207 | $ 26,598
Cost of revenue |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Stock-based compensation expense | 261 | 278 | 474 | 561
Research and development |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Stock-based compensation expense | 6,683 | 5,427 | 12,942 | 10,543
Sales and marketing |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Stock-based compensation expense | 3,632 | 3,407 | 7,040 | 6,948
General and administrative |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Stock-based compensation expense | $ 5,787 | $ 4,282 | $ 10,751 | $ 8,546

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