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Stock-based compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Mar. 28, 2020 | Mar. 30, 2019 | Mar. 28, 2020 | Mar. 30, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Stock-based compensation expense | $ 13,394 | $ 11,086 | $ 26,598 | $ 20,118
Cost of revenue |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Stock-based compensation expense | 278 | 218 | 561 | 403
Research and development |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Stock-based compensation expense | 5,427 | 4,284 | 10,543 | 7,888
Sales and marketing |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Stock-based compensation expense | 3,407 | 3,128 | 6,948 | 5,809
General and administrative |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Stock-based compensation expense | $ 4,282 | $ 3,456 | $ 8,546 | $ 6,018

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