Income Taxes (Details 3) - USD ($) $ in Thousands	Dec. 29, 2018	Dec. 30, 2017
Deferred Tax Assets:
Tax credit carryforwards	$ 197,524	$ 164,687
Reserves and accruals	43,522	42,357
Intangible assets	12,096	13,112
Capitalized research and development expense for income tax purposes	6,975	10,621
Operating loss carryforwards	15,347	20,650
Deferred income	6,580	12,178
Capital loss carryforwards	20,342	20,266
Stock-based compensation costs	15,329	15,782
Depreciation and amortization	8,759	7,665
Investments	2,900	3,201
Total deferred tax assets	329,374	310,519
Valuation allowance	(108,724)	(95,491)
Net deferred tax assets	220,650	215,028
Deferred Tax Liabilities:
Intangible assets	(36,194)	(36,683)
Undistributed foreign earnings	(27,627)	(23,563)
Other	(2,497)	(2,730)
Total deferred tax liabilities	(66,318)	(62,976)
Total net deferred tax assets	$ 154,332	$ 152,052