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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 25, 2021 | Dec. 26, 2020
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Components of Deferred Tax Assets and Liabilities [Abstract] |  |
Tax credits | $ 41,650 | $ 42,927
Inventory reserve | 13,691 | 13,401
Other reserves and accruals | 8,523 | 8,610
Non-statutory stock options | 2,837 | 2,794
Lease liability | 6,717 | 6,934
Depreciation and amortization | 17,912 | 20,961
Net operating loss carryforwards | 18,395 | 18,421
Gross deferred tax assets | 109,725 | 114,048
Valuation allowance | (40,698) | (38,466)
Total deferred tax assets | 69,027 | 75,582
Right of use asset | (5,910) | (6,074)
Acquired intangibles and fixed assets | (4,522) | (8,395)
Unrealized investment gains | (105) | (106)
Tax on undistributed earnings | (118) | (110)
Total deferred tax liabilities | (10,655) | (14,685)
Net deferred tax assets | $ 58,372 | $ 60,897

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