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Balance sheet components - Inventories, net (Details) - USD ($) $ in Thousands | Jun. 29, 2019 | Sep. 29, 2018
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Finished goods | $ 104,078 | $ 176,181
Component parts | 17,147 | 17,012
Inventories | $ 121,225 | $ 193,193

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