Income Taxes (Details 3) - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016
Deferred Tax Assets:
Tax credit carryforwards	$ 164,687	$ 180,999
Reserves and accruals	42,357	62,438
Intangible assets	13,112	23,335
Capitalized research and development expense for income tax purposes	10,621	19,093
Operating loss carryforwards	20,650	23,175
Deferred income	12,178	14,842
Capital loss carryforwards	20,266	20,580
Stock-based compensation costs	15,782	20,087
Depreciation and amortization	7,665	12,202
Investments	3,201	6,442
Prepaid expenses	0	26,526
Total deferred tax assets	310,519	409,719
Valuation allowance	(95,491)	(92,920)
Net deferred tax assets	215,028	316,799
Deferred Tax Liabilities:
Intangible assets	(36,683)	(35,651)
Undistributed foreign earnings	(23,563)	(24,529)
Other	(2,730)	(119)
Total deferred tax liabilities	(62,976)	(60,299)
Total net deferred tax assets	$ 152,052	$ 256,500