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Balance sheet components - Inventories, net (Details) - USD ($) $ in Thousands | Jun. 27, 2020 | Sep. 28, 2019
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Finished goods | $ 78,727 | $ 207,723
Component parts | 9,714 | 12,061
Inventories | $ 88,441 | $ 219,784

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