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Income taxes - Deferred tax assets and liabilities (Details) - USD ($) $ in Thousands | Sep. 29, 2018 | Sep. 30, 2017 | Oct. 01, 2016 | Oct. 03, 2015
--- | --- | --- | --- | ---
Deferred tax assets |  |  |  |
Accrued expenses and reserves | $ 5,639 | $ 8,828 |  |
Deferred revenue | 10,317 | 218 |  |
Inventory deferral | 0 | 3,259 |  |
U.S. net operating loss carryforwards | 18,385 | 53,589 |  |
Foreign net operating loss carryforwards | 5,625 | 1,147 |  |
Tax credit carryforwards | 22,969 | 17,553 |  |
Stock-based compensation | 7,237 | 7,976 |  |
Amortization | 3,237 | 3,859 |  |
Other | 427 | 324 |  |
Total deferred tax assets | 73,836 | 96,753 |  |
Valuation allowance | (72,380) | (94,956) | $ (95,882) | $ (33,264)
Deferred tax assets, net of valuation allowance | 1,456 | 1,797 |  |
Deferred tax liabilities |  |  |  |
Depreciation | (515) | (690) |  |
Total deferred tax liabilities | (515) | (690) |  |
Net deferred tax assets | $ 941 | $ 1,107 |  |

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