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Income taxes - Deferred tax assets and liabilities (Details) - USD ($) $ in Thousands | Sep. 28, 2019 | Sep. 29, 2018 | Sep. 30, 2017 | Oct. 01, 2016
--- | --- | --- | --- | ---
Deferred tax assets |  |  |  |
Accrued expenses and reserves | $ 12,582 | $ 5,639 |  |
Deferred revenue | 11,185 | 10,317 |  |
U.S. net operating loss carryforwards | 15,112 | 18,385 |  |
Foreign net operating loss carryforwards | 3,414 | 5,625 |  |
Tax credit carryforwards | 43,411 | 22,969 |  |
Stock-based compensation | 10,368 | 7,237 |  |
Amortization | 4,131 | 3,237 |  |
Depreciation | 672 | 0 |  |
Other | 453 | 427 |  |
Total deferred tax assets | 101,328 | 73,836 |  |
Valuation allowance | (95,088) | (72,380) | $ (94,956) | $ (95,882)
Deferred tax assets, net of valuation allowance | 6,240 | 1,456 |  |
Deferred tax liabilities |  |  |  |
Tax accounting method change | (5,086) | 0 |  |
Depreciation | 0 | (515) |  |
Total deferred tax liabilities | (5,086) | (515) |  |
Net deferred tax assets | $ 1,154 | $ 941 |  |

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