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Stock-Based Compensation - Stock-based compensation expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Oct. 03, 2020 | Sep. 28, 2019 | Sep. 29, 2018
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Stock-based compensation expense | $ 57,610 | $ 46,575 | $ 38,645
Cost of revenue |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Stock-based compensation expense | 1,106 | 985 | 198
Research and development |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Stock-based compensation expense | 23,439 | 17,643 | 13,960
Sales and marketing |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Stock-based compensation expense | 14,359 | 12,965 | 15,885
General and administrative |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Stock-based compensation expense | $ 18,706 | $ 14,982 | $ 8,602

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