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v3.20.2

Income Taxes - Deferred tax assets and liabilities (Details) - USD ($) $ in Thousands | Oct. 03, 2020 | Sep. 28, 2019 | Sep. 29, 2018 | Sep. 30, 2017
--- | --- | --- | --- | ---
Deferred tax assets |  |  |  |
Accrued expenses and reserves | $ 12,014 | $ 12,582 |  |
Deferred revenue | 11,831 | 11,185 |  |
U.S. net operating loss carryforwards | 8,242 | 15,112 |  |
Foreign net operating loss carryforwards | 12,183 | 3,414 |  |
Tax credit carryforwards | 53,543 | 43,411 |  |
Stock-based compensation | 11,018 | 10,368 |  |
Right-of-Use Liability | 14,377 | 0 |  |
Amortization | 7,648 | 4,131 |  |
Depreciation | 1,101 | 672 |  |
Other | 603 | 453 |  |
Total deferred tax assets | 132,560 | 101,328 |  |
Valuation allowance | (113,939) | (95,088) | $ (72,380) | $ (94,956)
Deferred tax assets, net of valuation allowance | 18,621 | 6,240 |  |
Deferred tax liabilities |  |  |  |
Tax accounting method change | (2,946) | (5,086) |  |
Right-of-Use Asset | 9,914 | 0 |  |
Amortization | (6,093) | 0 |  |
Depreciation | (187) | 0 |  |
Other | (115) | 0 |  |
Total deferred tax liabilities | (19,255) | (5,086) |  |
Net deferred tax assets (liabilities) | (634) |  |  |
Net deferred tax assets (liabilities) |  | 1,154 |  |
Deferred tax assets | 1,800 | 1,154 |  |
Deferred tax liabilities | $ (2,434) | $ 0 |  |

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