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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