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Stock-based Compensation - Schedule of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Jun. 27, 2026 | Jun. 28, 2025 | Jun. 27, 2026 | Jun. 28, 2025
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total stock-based compensation expense | $ 16,570 | $ 20,784 | $ 46,626 | $ 69,364
Income Statement Location [Axis]: us-gaap:CostOfGoodsAndServicesSold |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total stock-based compensation expense | 1,257 | 1,633 | 3,709 | 4,588
Income Statement Location [Axis]: us-gaap:GeneralAndAdministrativeExpense |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total stock-based compensation expense | 6,337 | 7,639 | 16,373 | 21,733
Income Statement Location [Axis]: us-gaap:ResearchAndDevelopmentExpense |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total stock-based compensation expense | 6,092 | 7,944 | 18,052 | 29,816
Income Statement Location [Axis]: us-gaap:SellingAndMarketingExpense |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total stock-based compensation expense | $ 2,884 | $ 3,568 | $ 8,492 | $ 13,227

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