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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 25, 2021
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Components of Deferred Tax Assets and Liabilities [Abstract] |  |
Tax credits | $ 33,025 | $ 41,650
Inventory reserve | 14,269 | 13,691
Other reserves and accruals | 6,527 | 8,523
Non-statutory stock options | 3,180 | 2,837
Lease liability | 6,024 | 6,717
Research and development expenditures capitalization | 36,821 | 19,553
Net operating loss carryforwards | 18,173 | 18,395
Gross deferred tax assets | 118,019 | 111,366
Valuation allowance | (43,295) | (40,698)
Total deferred tax assets | 74,724 | 70,668
Right-of-use assets | (5,219) | (5,910)
Acquired intangibles and fixed assets | (4,342) | (6,163)
Unrealized investment gains | (103) | (105)
Tax on undistributed earnings | (146) | (118)
Total deferred tax liabilities | (9,810) | (12,296)
Net deferred tax assets | $ 64,914 | $ 58,372

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