Income Taxes - Deferred Income Taxes Differences Between Carrying Amounts of Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 28, 2019	Dec. 29, 2018
Deferred tax assets:
Net operating losses	$ 301,929	$ 257,928
Research and foreign tax credits	121,065	221,943
Nondeductible accruals	72,094	50,312
Inventory valuation	31,982	39,430
Property, plant and equipment	4,601	2,591
Leasing Liabilities	19,265
Stock-based compensation	3,998	4,825
Total deferred tax assets	554,934	577,029
Valuation allowance	(484,834)	(493,157)
Net deferred tax assets	70,100	83,872
Deferred tax liabilities:
Accrual and reverse - lease	0	(16,802)
Depreciation	0	(199)
Accruals, reserves and prepaid expenses	(830)	(784)
Right of use asset	(16,261)
Acquired intangible assets	(34,542)	(49,406)
Convertible senior notes	(25,417)	(29,419)
Total deferred tax liabilities	(77,050)	(96,610)
Net deferred tax liabilities	$ (6,950)	$ (12,738)