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Balance sheet components - Finite-lived intangible assets, future amortization expense (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Mar. 28, 2020 | Sep. 28, 2019
Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, gross carrying amount | $ 7,566 |
Accumulated amortization | (536) |
Finite-lived intangible assets, net carrying value | 7,030 |
Intangible assets, gross carrying amount (excluding goodwill) | 27,679 |
Intangible assets, net carrying value (excluding goodwill) | $ 27,143 | $ 13
Weighted-average remaining life | 4 years 4 months 2 days |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |
Remainder of fiscal 2020 | $ 924 |
2021 | 1,848 |
2022 | 1,832 |
2023 | 1,235 |
2024 | 1,020 |
2025 | 171 |
Finite-lived intangible assets, net carrying value | 7,030 |
In progress research and development |  |
Finite-Lived Intangible Assets [Line Items] |  |
Indefinite-lived intangible assets (excluding goodwill) | 20,113 |
Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, gross carrying amount | 7,527 |
Accumulated amortization | (529) |
Finite-lived intangible assets, net carrying value | $ 6,998 |
Weighted-average remaining life | 4 years 3 months 29 days |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |
Finite-lived intangible assets, net carrying value | $ 6,998 |
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, gross carrying amount | 39 |
Accumulated amortization | (7) |
Finite-lived intangible assets, net carrying value | $ 32 |
Weighted-average remaining life | 3 days |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |
Finite-lived intangible assets, net carrying value | $ 32 |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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