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Income Taxes (Details 3) - USD ($) $ in Thousands | Dec. 28, 2019 | Dec. 29, 2018
--- | --- | ---
Deferred Tax Assets: |  |
Tax credit carryforwards | $ 206,008 | $ 197,524
Reserves and accruals | 47,562 | 43,522
Intangible assets | 583,323 | 12,096
Capitalized research and development expense for income tax purposes | 18,477 | 6,975
Operating loss carryforwards | 6,201 | 15,347
Deferred income | 16,704 | 6,580
Capital loss carryforwards | 17,320 | 20,342
Stock-based compensation costs | 15,097 | 15,329
Depreciation and amortization | 8,721 | 8,759
Investments | 2,459 | 2,900
Lease liability | 25,016 | 0
Total deferred tax assets | 946,888 | 329,374
Valuation allowance | (125,520) | (108,724)
Net deferred tax assets | 821,368 | 220,650
Deferred Tax Liabilities: |  |
Intangible assets | (24,907) | (36,194)
Undistributed foreign earnings | (31,916) | (27,627)
ROU assets | (25,016) | 0
Other | (8,350) | (2,497)
Total deferred tax liabilities | (90,189) | (66,318)
Total net deferred tax assets | $ 731,179 | $ 154,332

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