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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 26, 2020 | Dec. 29, 2018 | Dec. 28, 2019
Components of Deferred Tax Assets and Liabilities [Abstract] |  |  |
Tax credits | $ 42,927 |  | $ 44,696
Inventory reserve | 13,401 |  | 12,350
Other reserves and accruals | 9,470 |  | 5,852
Non-statutory stock options | 2,794 |  | 2,982
Depreciation and amortization | 20,961 |  | 27,758
Net operating loss carryforwards | 18,421 |  | 21,410
Gross deferred tax assets | 107,974 |  | 115,048
Valuation allowance | (38,466) |  | (36,604)
Total deferred tax assets | 69,508 |  | 78,444
Acquired intangibles and fixed assets | (8,395) |  | (13,997)
Unrealized investment gains | (106) |  | (106)
Tax on undistributed earnings | (110) |  | (75)
Total deferred tax liabilities | (8,611) |  | (14,178)
Net deferred tax assets | $ 60,897 |  | $ 64,266
Decrease in valuation allowance |  | $ 75,800 |
Consecutive period with positive operating performance | 2 years |  |
Cumulative period with U.S. pre-tax profit | 3 years |  |

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